Release v0.6.52: add Arc tool to screenshot editor

CMakeLists.txt

@@ -1,10 +1,24 @@
 cmake_minimum_required(VERSION 3.24)
-project(KSwitcher VERSION 0.6.41 LANGUAGES CXX RC)
+project(KSwitcher VERSION 0.6.52 LANGUAGES CXX RC)
 if(NOT WIN32)
   message(FATAL_ERROR "KSwitcher uses native Windows APIs")
 endif()
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
+add_executable(StayHere WIN32 utilities/StayHere/main.cpp)
+add_executable(StayHereTest WIN32 utilities/StayHere/main.cpp)
+target_compile_definitions(StayHereTest PRIVATE STAYHERE_TEST_INSTANCE)
+set_target_properties(StayHere PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/tools")
+foreach(utilityTarget StayHere StayHereTest)
+  target_compile_definitions(${utilityTarget} PRIVATE UNICODE _UNICODE _WIN32_WINNT=0x0A00)
+  target_link_libraries(${utilityTarget} PRIVATE user32 shell32 gdi32 wtsapi32)
+  if(MSVC)
+    target_compile_options(${utilityTarget} PRIVATE /utf-8)
+    set_property(TARGET ${utilityTarget} PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+  else()
+    target_link_options(${utilityTarget} PRIVATE -municode -static -static-libgcc -static-libstdc++)
+  endif()
+endforeach()
 add_library(kscore src/core.cpp src/platform.cpp src/autostart.cpp src/autocorrect.cpp src/storage.cpp src/ocr.cpp src/richtext.cpp src/update.cpp src/sync.cpp)
 target_include_directories(kscore PUBLIC src PRIVATE vendor)
 target_compile_definitions(kscore PUBLIC UNICODE _UNICODE WIN32_LEAN_AND_MEAN NOMINMAX _WIN32_WINNT=0x0A00)
@@ -30,6 +44,15 @@ target_link_libraries(KSwitcherScrollTests PRIVATE kscore)
 target_link_libraries(KSwitcherTests PRIVATE kscore)
 add_executable(KSwitcherIntegration tests/integration.cpp src/screenshot_launcher.cpp src/screenshot_activation.cpp src/app.cpp src/screenshot_notifications.cpp src/screenshot.cpp src/configuration.cpp src/ui.cpp resources/app.rc)
 target_link_libraries(KSwitcherIntegration PRIVATE kscore)
+# Opt-in interactive fixture: requires an installed Far Manager.
+add_executable(KSwitcherFarSnippetTests WIN32 tests/far_snippets.cpp src/screenshot_launcher.cpp src/screenshot_activation.cpp src/app.cpp src/screenshot_notifications.cpp src/screenshot.cpp src/configuration.cpp src/ui.cpp resources/app.rc)
+target_link_libraries(KSwitcherFarSnippetTests PRIVATE kscore)
+if(MSVC)
+  target_compile_options(KSwitcherFarSnippetTests PRIVATE /utf-8)
+  set_property(TARGET KSwitcherFarSnippetTests PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+else()
+  target_link_options(KSwitcherFarSnippetTests PRIVATE -municode -static -static-libgcc -static-libstdc++)
+endif()
 add_executable(KSwitcherInputTests tests/input.cpp src/screenshot_launcher.cpp src/screenshot_activation.cpp src/app.cpp src/screenshot_notifications.cpp src/screenshot.cpp src/configuration.cpp src/ui.cpp resources/app.rc)
 target_link_libraries(KSwitcherInputTests PRIVATE kscore)
 target_compile_definitions(KSwitcherInputTests PRIVATE KS_SCREENSHOT_RESOURCES)
@@ -66,6 +89,15 @@ else()
   target_link_options(KSwitcherOcrTests PRIVATE -static -static-libgcc -static-libstdc++)
 endif()
 enable_testing()
+add_executable(KSwitcherChatProfileTests tests/chat_profiles.cpp src/screenshot_launcher.cpp src/screenshot_activation.cpp src/app.cpp src/screenshot_notifications.cpp src/screenshot.cpp src/configuration.cpp src/ui.cpp resources/app.rc)
+target_link_libraries(KSwitcherChatProfileTests PRIVATE kscore)
+if(MSVC)
+  target_compile_options(KSwitcherChatProfileTests PRIVATE /utf-8)
+  set_property(TARGET KSwitcherChatProfileTests PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+else()
+  target_link_options(KSwitcherChatProfileTests PRIVATE -static -static-libgcc -static-libstdc++)
+endif()
+add_test(NAME chat-profile-regressions COMMAND KSwitcherChatProfileTests)
 add_executable(KSwitcherHistoryHostTests tests/history_host.cpp)
 target_link_libraries(KSwitcherHistoryHostTests PRIVATE kscore psapi)
 set_target_properties(KSwitcherHistoryHostTests PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/history-host-fixture-$<CONFIG>")
@@ -111,6 +143,14 @@ add_test(NAME dictionary-regressions COMMAND KSwitcherDictionaryTests)
 set_tests_properties(dictionary-regressions PROPERTIES WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
 add_test(NAME sync-regressions COMMAND KSwitcherSyncTests)
 add_test(NAME native-regressions COMMAND KSwitcherTests)
+add_executable(KSwitcherUtilitiesTests tests/utilities.cpp)
+if(MSVC)
+  set_property(TARGET KSwitcherUtilitiesTests PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+else()
+  target_link_options(KSwitcherUtilitiesTests PRIVATE -static -static-libgcc -static-libstdc++)
+endif()
+add_test(NAME utilities-regressions COMMAND KSwitcherUtilitiesTests)
+add_test(NAME stayhere-lifecycle COMMAND powershell -NoProfile -ExecutionPolicy Bypass -File "${CMAKE_CURRENT_SOURCE_DIR}/tests/stayhere.ps1" -Executable "$<TARGET_FILE:StayHereTest>")
 add_test(NAME scroll-regressions COMMAND KSwitcherScrollTests)
 add_test(NAME input-regressions COMMAND KSwitcherInputTests)
 add_test(NAME screenshot-ui-regressions COMMAND KSwitcherScreenshotUITests)

README.md

@@ -75,6 +75,9 @@ Ctrl+Alt+Delete and Win+L; these cannot be assigned.
 
 Keyboard and mouse input forwarded by Microsoft Mouse Without Borders follows the same input
 path as a local keyboard/mouse, including shortcuts, recent-word conversion and snippets.
+On the sending computer, KSwitcher ignores keyboard events consumed by another keyboard hook
+(including Mouse Without Borders forwarding). The receiving computer still processes delivered
+input normally, so both computers can run KSwitcher without starting duplicate snippet operations.
 KSwitcher marks its own generated input so copy/paste, selection, modifier releases and shell-mask
 keys cannot trigger recursive commands or overwrite the recorded typing run. Other injected input
 is accepted, including key-up events and VK-only keyboard events. Unicode packets do not provide
@@ -199,6 +202,10 @@ snapping and shape constraints are unchanged.
 Both drawn and recognized triangles have three independent vertex handles instead of bounding-box
 resize handles. Drag any vertex to reshape the triangle while keeping the other two fixed, even
 after rotation. Vertex edits support undo/redo, and the rotation and thickness handles remain available.
+**Arc (U)** draws an open half ellipse inside the dragged rectangle. Use the corner handles
+to resize it and the round handle to rotate it (Shift snaps to 15 degrees). Arcs support
+color, thickness, line style, moving, cloning, undo/redo and PNG export.
+
 **Trapezoid (B)** on the toolbar creates a trapezoid with parallel bases. Pencil recognition also
 fits nearly parallel, unequal bases into a clean trapezoid. Trapezoids support bounding-box resizing,
 rotation, styling and undo/redo; Ctrl+Z after recognition restores the original pencil stroke.
@@ -267,6 +274,75 @@ thumbnails and source labels aligned with the scaled fonts and spacing.
 
 ## Implemented
 
+### Chat language profiles — v0.6.48
+
+> From v0.6.50: Viber chat OCR is temporarily disabled. Saved Viber profiles are retained but inactive. Telegram and Teams profiles are unchanged; clipboard/image OCR remains available.
+>
+> З v0.6.50: OCR чатів Viber тимчасово вимкнений. Збережені профілі Viber залишаються, але не діють. Профілі Telegram і Teams та OCR зображень/буфера працюють як раніше.
+
+
+Settings separates General, Languages, Shortcuts, Clipboard and Tools into native tabs.
+Switching tabs preserves edits; Save, Cancel, Import and Export stay available below every page.
+
+Open the desired chat in Telegram Desktop or Microsoft Teams, then open Settings → Languages →
+**Languages for a chat…**. Select the chat and click the languages to include. Choose
+**Use languages**, then **Save** in Settings. The subset order is saved from the main
+layout list when editing the profile; one-language profiles are supported. **Remove profile** restores default behavior.
+
+For a matching chat, **Alt+Shift**, **Win+Space** (and reverse **Win+Shift+Space**) cycle
+through that subset. KSwitcher's **Next layout** conversion uses the same subset.
+Explicit KSwitcher hotkey bindings take precedence. Without a matching profile,
+Windows shortcuts keep their normal behavior and Next layout uses the global cycle.
+Unavailable layouts are skipped; if none remain installed, the global cycle is used.
+Direct layout shortcuts are unchanged. Profiles do not change Windows' installed languages.
+
+Matching uses the application and visible chat name, not a unique account/contact ID.
+Identically named chats in one application share a profile; renamed chats need a new
+profile. Telegram unread counters are ignored. Teams currently recognizes the desktop
+`Chat | name | Microsoft Teams` title format; other Teams title formats are not supported.
+Experimental Viber profiles introduced in v0.6.49 are disabled in v0.6.50 because repeated OCR caused delays. There is no background Viber OCR, recognition during language switching, or recognition when opening profiles. Saved Viber profiles are retained and marked inactive; Windows switching and Next layout use their normal/global behavior in Viber. Clipboard and image OCR are unchanged.
+Profiles stay on this PC (excluded from cloud sync), and are included in manual settings
+export/import. Available from v0.6.48.
+
+**Українською.** Налаштування розділено на вкладки General, Languages, Shortcuts, Clipboard
+і Tools. Перехід між ними зберігає незбережені зміни; Save, Cancel, Import і Export доступні
+на кожній вкладці. Відкрий потрібний чат у Telegram або Teams, потім **Settings → Languages → Languages
+for a chat…**. Вибери чат і потрібні мови, натисни **Use languages**, а потім **Save**.
+Набір діє для **Alt+Shift**, **Win+Space**, **Win+Shift+Space** та **Next layout** KSwitcher.
+Можна вибрати й одну мову; порядок зберігається із загального списку під час редагування профілю. **Remove profile**
+повертає звичайну поведінку. Без профілю системні комбінації працюють як раніше,
+а Next layout використовує загальний набір. Видалені з Windows розкладки пропускаються;
+якщо доступних мов профілю не залишилося, використовується загальний набір.
+Прямі комбінації мов не змінюються; явно задані комбінації KSwitcher мають пріоритет.
+Зіставлення виконується за програмою та назвою чату: однакові назви в одній програмі
+мають спільний профіль, після перейменування потрібен новий. Лічильник непрочитаних
+Telegram ігнорується. Teams підтримує зазначений вище формат заголовка.
+Експериментальні профілі Viber із v0.6.49 вимкнено у v0.6.50 через затримки від повторного OCR. Фонове розпізнавання, OCR при перемиканні мов та відкритті профілів більше не запускаються. Профілі Viber збережені й позначені як неактивні; системне перемикання та Next layout у Viber використовують звичайну поведінку й загальний набір. OCR буфера та зображень не змінено.
+Профілі локальні, входять до ручного експорту/імпорту, але не до
+хмарної синхронізації. Доступно з v0.6.48.
+
+
+### Telegram Web in Chrome — v0.6.51
+
+Open a chat in Telegram Web K (`https://web.telegram.org/k/`) in Chrome, then use **Settings → Languages → Languages for a chat...** and select **Telegram Web: name**. Choose languages, then **Use languages → Save**. The same subset applies to Alt+Shift, Win+Space, Win+Shift+Space and Next layout. Web profiles are separate from desktop Telegram profiles. Same-name chats across browser profiles/accounts share a web profile.
+
+Recognition uses Chrome accessibility: the address bar and active document must both identify a Telegram chat, then the visible header supplies the name. The app watches foreground/focus and address/header-change events; it does not use OCR, a polling timer, an extension, or message-history extraction. The address bar, home page and unsupported URLs do not match. Web A and other browsers have not been validated and are not advertised as supported. Page or accessibility changes can make a chat unavailable instead of guessing.
+
+**Українською.** З v0.6.51 підтримано Telegram Web K у Chrome. Відкрий чат, потім **Settings → Languages → Languages for a chat...**, вибери **Telegram Web: ім’я**, мови та **Use languages → Save**. Набір діє для Alt+Shift, Win+Space, Win+Shift+Space і Next layout. Вебпрофілі окремі від Telegram Desktop; однакові назви в різних акаунтах/профілях браузера мають спільний вебпрофіль. Адреса й назва беруться через accessibility, без OCR, таймера, розширення та читання історії повідомлень. В адресному рядку, на головній сторінці й для непідтримуваних адрес профіль не діє. Web A та інші браузери не перевірені й не заявлені як підтримувані.
+
+### Application-specific snippets — v0.6.51
+
+In **Tools → Snippets**, select a snippet and enable **Only in these applications**. Enter executable names separated by commas, or select a currently open application's process and choose **Add app**. For example: `ms-teams.exe, outlook.exe`. Uncheck the option for a global snippet. A checked but empty restriction cannot be saved. Save applies the changes; Cancel discards them.
+
+A matching application-specific snippet takes precedence over a global snippet with the same trigger. The same trigger can be used for different applications; overlapping scopes for the same trigger are rejected. Existing snippets without a scope remain global. Matching is case-insensitive by process name, with or without `.exe`, and is checked before insertion. No OCR or timer is involved. Chrome scope means the entire browser, not one website.
+
+Scopes are saved with snippets and included in manual import/export and synchronization; merge conflicts consider the application scopes. Use v0.6.51 or newer on every synchronizing PC before sharing scoped snippets: older versions do not understand the restriction and may treat the snippet as global.
+
+**Українською.** У **Tools → Snippets** вибери сніпет, увімкни **Only in these applications** та задай назви процесів через кому або вибери відкриту програму зі списку й натисни **Add app**. Наприклад: `ms-teams.exe, outlook.exe`. Вимкнений прапорець означає всі програми. Увімкнений прапорець із порожнім списком не можна зберегти. **Save** зберігає, **Cancel** відкидає зміни.
+
+Сніпет конкретної програми має пріоритет над глобальним із тим самим тригером. Для різних програм однакові тригери дозволені, для перетинних областей — ні. Старі сніпети залишаються глобальними. Зіставлення за назвою процесу не залежить від регістру та суфікса `.exe`; OCR і таймерів немає. Для Chrome це весь браузер, а не окремий сайт. Обмеження входять до експорту/імпорту та синхронізації. Перед синхронізацією онови всі ПК до v0.6.51 або новішої: старі версії не розуміють обмеження та можуть застосувати сніпет глобально.
+### Existing features
+
 - Installed Windows keyboard layouts, configurable cycle/order and direct shortcuts; IMEs are switch-only.
   Text conversion cycles skip layouts that leave the text unchanged and use the next enabled layout
   that changes it. If none changes the text, the operation keeps the text and advances one layout.
@@ -274,10 +350,24 @@ thumbnails and source labels aligned with the scaled fonts and spacing.
   of the complete expected text. Browser/editor compatibility depends on its handling of simulated input.
 - Selection conversion and verified recent input (physical scan codes, 2-second typing-run boundary).
 - Same-process clipboard ownership plus verified WebView2 descendants, including the Teams fix.
+  Clipboard synchronizers such as Mouse Without Borders may republish a copy only when
+  KSwitcher first observed it owned by the target application and the selection text and
+  editor selection metadata remain identical. Unobserved or altered foreign copies are rejected.
+  Snippets normally require accessibility verification of their selected trigger and pasted text,
+  even with logging disabled. If verification is unavailable or the paste differs, expansion
+  stops without running cursor or Enter actions. Clipboard changes during paste also cancel actions.
+  Far Manager uses its native Alt+Shift+Arrow selection, Ctrl+Insert copy and Shift+Insert
+  paste commands instead: both the trigger and inserted text must match verified clipboard
+  copies from Far. Cancellation restores the full temporary selection, not one cursor step.
+  Far supports nonempty single-line replacements up to 4096 caret steps, including
+  `{cursor}` and verified `{enter}` actions. Empty or multiline replacements are rejected
+  before selection; pasting a newline could execute a command before it can be verified.
 - Teams recent-word conversion uses a single word-selection command and validates the copied range.
   If the editor's word boundary differs from the recorded typing, it falls back to paced character
   selection: Teams can coalesce a burst of Shift+Left events into just one character.
 - Clipboard snapshot/restoration with concurrent-copy, foreground and input-version checks.
+  A snapshot interrupted by a concurrent clipboard publication is retried up to three total
+  attempts before selection starts, provided the foreground and input context remain unchanged.
   A silently dropped copy is retried up to three total attempts while the clipboard and input
   context remain unchanged. Temporary transaction contents are excluded from Windows clipboard
   history and cloud synchronization. Paste is not blindly retried: with manual paste readback
@@ -525,6 +615,30 @@ OpenBao administrator setup:
 and UI integration, so another service can be added without replacing the synchronization logic.
 Protocol and conflict regressions run with `build.ps1 -Test` or CMake's `sync-regressions` test.
 
+## Portable utilities
+
+The tray menu's **Tools** submenu lists `.exe` files in a `tools` folder beside
+`KSwitcher.exe`, sorted by filename. For example, place `StayHere.exe` at
+`tools/StayHere.exe` and choose **Tools → StayHere** to launch it manually.
+The folder is rescanned whenever the menu opens; no configuration or restart is needed.
+Only files directly in `tools` are listed (not subfolders, shortcuts, or KSwitcher's
+own executables beside the main program). Utilities start with `tools` as their working
+directory and are never started automatically. Their lifetime is independent of KSwitcher.
+An absent or empty folder displays a disabled placeholder; launch errors are reported.
+From v0.6.45, the release includes `tools/README.txt`, so extracting the ZIP or
+installing an update creates the folder. Add your own trusted portable executables;
+StayHere is bundled from v0.6.46, and settings synchronization does not transfer
+utility files. Updates preserve personal utilities and refresh bundled StayHere and
+documentation. Repository development scripts
+are not included in the portable tools folder.
+
+Choose **Tools → StayHere** to start the bundled activity utility. It starts
+enabled; left-click its tray icon to pause/resume or right-click for Exit. While
+enabled it prevents automatic sleep and, after three minutes without input, sends
+F15 on its 15-second check. It does not move the mouse, bypass locking, start with
+KSwitcher automatically, or directly control Teams status. Locked/disconnected
+sessions do not receive simulated activity. See `tools/StayHere-README.md`.
+
 ## Build
 
 The easiest reproducible local route uses the pinned portable w64devkit toolchain:
@@ -558,8 +672,10 @@ default and require the main **Automatic correction (experimental)** checkbox to
 
 - **Use custom replacements**: enter one `typo=correction` pair per line, for example
   `првиіт=привіт` or `helo=hello`. Entries are normalized to lowercase; duplicate source words
-  are rejected. Each side must contain 1–32 letters of the same supported language, without
+  are rejected. The typo must contain 1–32 letters. The correction may contain several words
-  spaces or punctuation. Explicit pairs take priority over dictionary recognition, including
+  separated by single spaces, for example `мамамила=мама мила`, up to 32 characters including
+  spaces. Both sides must use the same supported language, without punctuation; leading,
+  trailing and repeated spaces are not allowed. Explicit pairs take priority over dictionary recognition, including
   already valid words, and do not require dictionary membership or satisfy the frequency limit.
 - **Correct spelling typos using dictionaries**: checks unknown words in the current language
   after no layout correction is found. It accepts exactly one dictionary candidate reachable
@@ -575,6 +691,8 @@ ALL CAPS, mixed-case identifiers, numbers, URLs and email addresses are skipped.
 is applied once, without chaining. Click **OK**, then **Save** in Settings; pairs and switches
 are included in settings export/import and synchronization. Undo restores the original word
 and suppresses its correction until restart.
+When synchronizing phrase replacements, update all participating PCs to v0.6.47 or newer;
+older clients reject spaces in replacement pairs.
 
 ### Layout correction and shared options
 
@@ -648,6 +766,7 @@ Run `./package.ps1 -PublishRelease` after building and testing to refresh the tr
 .\build.ps1 -Test          # Pure/native regression checks; does not touch the user's clipboard
 .\build.ps1 -Ocr           # Render a synthetic image, decode it with WIC and recognize it with Windows OCR
 .\build.ps1 -Integration   # Interactive, isolated test editor; avoid input for about 10 seconds
+.\build.ps1 -Far           # Explicit integration test using an isolated Far Manager profile
 .\tests\configuration.ps1 # Separate-process settings tests; close KSwitcher first
 ```
 
@@ -720,13 +839,13 @@ Consecutive duplicates use SHA-256 fingerprints inside the encrypted history ind
 
 Moving OCR isolates its temporary memory rather than reducing the combined processing peak. A controlled three-run comparison retained about 0.8 MiB less private RAM in the caller after recognition; combined peak RAM was about 55.6 MiB before and 56.6 MiB with the helper. Results depend on the image, OCR engine and system.
 
-### Pinned history filter — v0.6.41
+### Pinned history checkbox — v0.6.42
 
-Use **Filter → All items / ★ Pinned only** beside the history search box to show all entries or only pinned entries. The text search applies within that filter. Unpinning an item removes it from the pinned view immediately. The filter and search are remembered after closing and reopening history. **Clear history…** still deletes the entire history after confirmation, including entries hidden by the filter.
+Check **★ Pinned only** beside the history search box to show only pinned entries; uncheck it to show all entries. The checkbox sits on the left, immediately followed by the search box; its right edge stays aligned with the history list when resizing. The text search applies within that filter. Unpinning an item removes it from the pinned view immediately. The checkbox state and search are remembered after closing and reopening history. **Clear history…** still deletes the entire history after confirmation, including entries hidden by the filter.
 
 ### History process and clipboard memory — v0.6.40
 
-History opens in a separate, short-lived instance of **KSwitcher.exe**. **Esc** closes it even when focus is on the window or an action button, releasing Windows UI allocations with the process. The resident keeps keyboard hooks, clipboard capture and history storage. Search, selection and the top entry are preserved in encrypted view state. If a full-text item viewer is still open, the helper stays alive until the last viewer closes. Pin/delete, formatted/plain paste and OCR remain available; settings and default shortcuts are unchanged.
+History opens in a separate, short-lived instance of **KSwitcher.exe**. **Esc** closes it even when focus is on the window or an action button, releasing Windows UI allocations with the process. The resident keeps keyboard hooks, clipboard capture and history storage. Search and the pinned-only filter are preserved in encrypted view state. Each fresh opening selects and reveals the newest matching entry; background refreshes preserve the selected record while browsing. If a full-text item viewer is still open, the helper stays alive until the last viewer closes. Pin/delete, formatted/plain paste and OCR remain available; settings and default shortcuts are unchanged.
 
 Image thumbnails are decoded in **KSwitcher.Screenshot.exe**, returning only bounded preview pixels. Image clipboard backup/restore also uses that helper and encrypted temporary files, with clipboard-sequence checks before restoring. Selection reads avoid loading image formats. Keep all three executables together; no fourth executable is required. Paste allows a brief foreground handoff after history closes while preserving cancellation checks. UI Automation remains in the resident.
 

Release/README.md

@@ -1,20 +1,22 @@
 # Latest Windows release
 
-## v0.6.41 — 2026-11-04
+## v0.6.52 — 2026-11-06
 
 ## Changes
-- Added Filter → All items / ★ Pinned only beside the history search box.
+- Add **Arc (U)** to the screenshot editor toolbar, with its own cursor and drawing hint. Drag a rectangle to draw an open half ellipse; the endpoints are not joined by a straight chord.
-- Search is restricted to the selected filter; Unpin immediately removes an entry from the pinned view.
+- Resize arcs using the corner handles, rotate them with the round handle (Shift snaps to 15 degrees), move or clone them, and adjust their color, thickness and line style. Undo/redo, connector attachment and full-resolution PNG export preserve the open curve.
-- The filter and search are remembered across Esc and helper restarts. Older saved view state defaults to All items.
+- Widen the editor's minimum window width to fit the additional toolbar button.
-- Filtering occurs before content search and preview loading. History still exits its helper when closed; shortcuts and Clear history semantics are unchanged.
+- Retain v0.6.51 Telegram Web K chat profiles in Chrome and application-specific snippets, including their compatibility requirements below.
 
 ## Validation
-A dedicated 500-entry integration suite verifies filtering, search intersection, unpinning the last match, returning to all items, persistence across helper restart, text/image paste, clipboard restoration and history helper shutdown. The installed development build was also checked visually. The v0.6.41 release candidate passed dictionary equivalence, 105 synchronization checks and 315 native checks. Its interactive input rerun could not obtain foreground/clipboard access in the current Windows session. The filter integration and visual checks passed before the version-only rebuild; they were not repeated successfully in the inaccessible session.
+Passed 332 native checks, 568 input checks, 674 chat-profile checks, 108 sync checks, dictionary equivalence (140,939 words), wheel, StayHere, Utilities, screenshot UI/save/registration, 54 updater checks and updater progress checks. Arc checks cover toolbar selection, drawing, open-curve hit testing and rendering, resizing, rotation, connector attachment, undo/redo and PNG export. Inspected an actual editor rendering with the Arc tool selected. Published package checksums, manifests, executable versions, update selection and English/Ukrainian Wiki pages are verified during publication.
 
-## Upgrade
+## Upgrade and compatibility
 Choose **Update** in the tray menu. Legacy v0.3.0–v0.4.1 clients first receive the v0.4.2 compatibility bridge, then the current full release. v0.2.3 and earlier require manual installation.
-For manual installation, exit KSwitcher, close screenshot editors and extract the entire ZIP into its installation folder. Keep personal `data/` and customized dictionaries.
+For manual installation, exit KSwitcher, close its configurator and screenshot editors, and extract the entire ZIP into its installation folder. Keep personal `data/`, customized dictionaries and your own tools. Keep the three KSwitcher executables together; StayHere runs independently.
 
-Download **KSwitcher-win-x64.zip** with **SHA256SUMS.txt**. Keep all three executables together; history uses another instance of KSwitcher.exe, so no fourth executable is required. The package contains no personal settings, credentials or clipboard history.
+**Update every synchronizing PC to v0.6.51 or newer before sharing application-specific snippets. Older versions do not understand application restrictions and may treat scoped snippets as global.** Keep a backup before downgrading. Settings with Telegram Web profiles require v0.6.51 or newer. Chat profiles remain local, included in manual export/import and excluded from cloud synchronization.
+
+Download **KSwitcher-win-x64.zip** with **SHA256SUMS.txt**. The package contains no personal settings, credentials or clipboard history.
 
 Publish stable `release-vX.Y.Z` tags matching the executable version. Keep `v0.4.2` as the last legacy tag.

Release/SHA256SUMS.txt

@@ -1 +1 @@
-d367a27bb90895f6e33c41726beeb078edbd924aa96a59904de1c54804b23be9  KSwitcher-win-x64.zip
+fdc093c4a45c55fcee7ae4c9b597d56ea95293bd8995ed84cc2c0460e8855d58  KSwitcher-win-x64.zip

Release/release-files.json

@@ -0,0 +1,81 @@
+{
+  "version": "0.6.51",
+  "schema": 1,
+  "files": [
+    {
+      "size": 1847296,
+      "path": "KSwitcher.exe",
+      "sha256": "c40f90944169ec6f1b92803ccaec734573bf798939f13ab3553b982b709e479c"
+    },
+    {
+      "size": 1716224,
+      "path": "KSwitcher.Config.exe",
+      "sha256": "8e8a5fee9be8f318b78516b82415c6b098ac67f7c374f4667ef271576a77f9fa"
+    },
+    {
+      "size": 2897408,
+      "path": "KSwitcher.Screenshot.exe",
+      "sha256": "bb5ffc3a26955c752d593ba06f69476985d9902f2ed0345fe3efe9bfc2eb63c8"
+    },
+    {
+      "size": 4401,
+      "path": "LICENSE",
+      "sha256": "d3c81140cce01c26bf6cbf52aa40e0825e1fa35b9a91d1387170a65d2597082c"
+    },
+    {
+      "size": 1096,
+      "path": "json-LICENSE.txt",
+      "sha256": "61e08da79c44061654015ce6b0c4061c23ee1dd18237fbf09e9bfda3c0ea2831"
+    },
+    {
+      "size": 74601,
+      "path": "README.md",
+      "sha256": "818f81e6c4bfaa6b014ac50351ec22f68ee6eb3c094ad5ecb7bac98d605e0918"
+    },
+    {
+      "size": 732485,
+      "path": "dictionaries/en.txt",
+      "sha256": "d0c022b27b9fbc2ff7b6b8bec723cc1adc4eef517202f9ff77eed5d8bea3acb9"
+    },
+    {
+      "size": 20566,
+      "path": "dictionaries/LICENSE-CC-BY-SA-4.0.txt",
+      "sha256": "0bdfb0201d1803634f268cdff0993b8349d2c70e956a06dbb667c8dd65254ec5"
+    },
+    {
+      "size": 2265,
+      "path": "dictionaries/README.md",
+      "sha256": "3017bf44d3be9d9dfab21bd6778aa52b7947e61acf9ce2bc86b41d6e949ac311"
+    },
+    {
+      "size": 1109134,
+      "path": "dictionaries/ru.txt",
+      "sha256": "80e6b6a27815973535f7facb636c597eb845dfee45cfabfc4e9b3341b9332849"
+    },
+    {
+      "size": 1280,
+      "path": "dictionaries/sources.json",
+      "sha256": "98e5b3fe7304e37705c9e5ff48b0b399ccb16e806736d21f09921b99e5f2a408"
+    },
+    {
+      "size": 940799,
+      "path": "dictionaries/uk.txt",
+      "sha256": "d30e990d6ec2983c04f3644a3c61c6c668e8c542323f5931916fdd55b916eebf"
+    },
+    {
+      "size": 993,
+      "path": "tools/README.txt",
+      "sha256": "a34b5161a8315af037e1ec71d816bfc688f7c364141d4ee2347cf0515ef0c82a"
+    },
+    {
+      "size": 134656,
+      "path": "tools/StayHere.exe",
+      "sha256": "6ef5cf64708d62b7fc63c3c793cc99188a513433ff4774cae01dc014f6664376"
+    },
+    {
+      "size": 2796,
+      "path": "tools/StayHere-README.md",
+      "sha256": "ba214e2aca7405e698b3ab21ceb1f41ce088edd996b3e30e4a9d58ff496f9413"
+    }
+  ]
+}

build.ps1

@@ -1,4 +1,4 @@
-param([switch]$Test, [switch]$Integration, [switch]$Ocr, [switch]$Stage)
+param([switch]$Test, [switch]$Integration, [switch]$Ocr, [switch]$Stage, [switch]$Far)
 $ErrorActionPreference = 'Stop'
 $root = $PSScriptRoot
 $compiler = Join-Path $root '.tools\w64devkit\bin\g++.exe'
@@ -16,6 +16,12 @@ Push-Location $root
 try {
     $common = @('-std=c++20','-Os','-DNDEBUG','-DUNICODE','-D_UNICODE','-DWIN32_LEAN_AND_MEAN','-DNOMINMAX','-D_WIN32_WINNT=0x0A00','-Wall','-Wextra','-Wno-missing-field-initializers','-Isrc','-Ivendor','-ffunction-sections','-fdata-sections')
     $libs = @('-lwinhttp','-luser32','-lshell32','-lshlwapi','-ladvapi32','-lcrypt32','-limm32','-lcomctl32','-lgdi32','-lole32','-loleaut32','-ltaskschd','-lcomdlg32','-luuid','-lwindowscodecs','-lruntimeobject','-luiautomationcore')
+    $utilityDirectory = Join-Path (Split-Path $executablePath) 'tools'
+    New-Item -ItemType Directory -Force $utilityDirectory,build/release/tools | Out-Null
+    $stayHere = Join-Path $utilityDirectory 'StayHere.exe'
+    & $compiler @common -Werror -mwindows -municode -static -s utilities/StayHere/main.cpp -luser32 -lshell32 -lgdi32 -lwtsapi32 -o $stayHere
+    if ($LASTEXITCODE) { throw 'StayHere build failed' }
+    Copy-Item -LiteralPath $stayHere -Destination build/release/tools/StayHere.exe -Force
     foreach ($name in @('core','platform','autostart','autocorrect','storage','sync','ocr','richtext','update','screenshot','screenshot_main','screenshot_notifications','screenshot_activation','screenshot_launcher','app','ui','main','configuration','config_main')) {
         & $compiler @common -c "src/$name.cpp" -o "build/$name.o"
         if ($LASTEXITCODE) { throw "Compilation failed: $name" }
@@ -41,6 +47,14 @@ try {
     if ($LASTEXITCODE) { throw 'Screenshot link failed' }
     Copy-Item -LiteralPath $screenshotPath -Destination build/release/KSwitcher.Screenshot.exe -Force
     if ($Test) {
+        & $compiler @common -Werror -DSTAYHERE_TEST_INSTANCE -mwindows -municode -static -s utilities/StayHere/main.cpp -luser32 -lshell32 -lgdi32 -lwtsapi32 -o build/StayHereTest.exe
+        if ($LASTEXITCODE) { throw 'StayHere fixture build failed' }
+        & "$env:SystemRoot\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File tests/stayhere.ps1 -Executable (Join-Path $outDir 'StayHereTest.exe')
+        if ($LASTEXITCODE) { throw 'StayHere lifecycle tests failed' }
+        & $compiler @common tests/utilities.cpp -static -s -o build/KSwitcherUtilitiesTests.exe
+        if ($LASTEXITCODE) { throw 'Utilities test build failed' }
+        & .\build\KSwitcherUtilitiesTests.exe
+        if ($LASTEXITCODE) { throw 'Utilities tests failed' }
         & $compiler @common tests/dictionary.cpp build/core.o build/platform.o build/autocorrect.o @libs -lpsapi -static -s -o build/KSwitcherDictionaryTests.exe
         if ($LASTEXITCODE) { throw 'Dictionary test build failed' }
         & .\build\KSwitcherDictionaryTests.exe
@@ -61,6 +75,10 @@ try {
         if ($LASTEXITCODE) { throw 'Input test build failed' }
         & .\build\KSwitcherInputTests.exe
         if ($LASTEXITCODE) { throw 'Input tests failed' }
+        & $compiler @common tests/chat_profiles.cpp build/core.o build/platform.o build/autostart.o build/autocorrect.o build/storage.o build/sync.o build/ocr.o build/richtext.o build/update.o build/screenshot.o build/screenshot_launcher.o build/screenshot_activation.o build/screenshot_notifications.o build/app.o build/configuration.o build/ui.o build/screenshot-res.o @libs -static -s -o build/KSwitcherChatProfileTests.exe
+        if ($LASTEXITCODE) { throw 'Chat profile test build failed' }
+        & .\build\KSwitcherChatProfileTests.exe
+        if ($LASTEXITCODE) { throw 'Chat profile tests failed' }
         & $compiler @common tests/screenshot_ui.cpp build/core.o build/platform.o build/ocr.o build/screenshot-res.o @libs -static -s -o build/KSwitcherScreenshotUITests.exe
         if ($LASTEXITCODE) { throw 'Screenshot UI test build failed' }
         & .\build\KSwitcherScreenshotUITests.exe
@@ -80,6 +98,13 @@ try {
         & "$env:SystemRoot\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File tests/update_progress.ps1
         if ($LASTEXITCODE) { throw 'Updater progress UI tests failed' }
     }
+    if ($Far) {
+        & $compiler @common tests/far_snippets.cpp build/core.o build/platform.o build/autostart.o build/autocorrect.o build/storage.o build/sync.o build/ocr.o build/richtext.o build/update.o build/screenshot.o build/screenshot_launcher.o build/screenshot_activation.o build/screenshot_notifications.o build/app.o build/configuration.o build/ui.o build/screenshot-res.o @libs -mwindows -municode -static -s -o build/KSwitcherFarSnippetTests.exe
+        if ($LASTEXITCODE) { throw 'Far snippet test build failed' }
+        $fixture = Start-Process -FilePath (Join-Path $outDir 'KSwitcherFarSnippetTests.exe') -WindowStyle Hidden -Wait -PassThru
+        Get-Content -LiteralPath (Join-Path $outDir 'far-snippets.log')
+        if ($fixture.ExitCode) { throw 'Far snippet tests failed' }
+    }
     if ($Integration) {
         $historyFixture = Join-Path (Resolve-Path build) ('history-host-fixture-' + [guid]::NewGuid().ToString('N'))
         New-Item -ItemType Directory $historyFixture | Out-Null

package.ps1

@@ -10,8 +10,12 @@ Copy-Item -LiteralPath (Join-Path $root 'LICENSE') -Destination $destination
 Copy-Item -LiteralPath (Join-Path $root 'vendor\json-LICENSE.txt') -Destination $destination
 Copy-Item -LiteralPath (Join-Path $root 'README.md') -Destination $destination
 Copy-Item -LiteralPath (Join-Path $root 'dictionaries') -Destination $destination -Recurse -Force
+New-Item -ItemType Directory -Force (Join-Path $destination 'tools') | Out-Null
+Copy-Item -LiteralPath (Join-Path $root 'resources\portable-tools-README.txt') -Destination (Join-Path $destination 'tools\README.txt') -Force
+Copy-Item -LiteralPath (Join-Path $root 'build\release\tools\StayHere.exe') -Destination (Join-Path $destination 'tools\StayHere.exe') -Force
+Copy-Item -LiteralPath (Join-Path $root 'utilities\StayHere\README.md') -Destination (Join-Path $destination 'tools\StayHere-README.md') -Force
 # Enumerate the distributable files explicitly; do not include a user's data directory.
-$files = @('KSwitcher.exe','KSwitcher.Config.exe','KSwitcher.Screenshot.exe','LICENSE','json-LICENSE.txt','README.md','dictionaries') | ForEach-Object { Join-Path $destination $_ }
+$files = @('KSwitcher.exe','KSwitcher.Config.exe','KSwitcher.Screenshot.exe','LICENSE','json-LICENSE.txt','README.md','dictionaries','tools\README.txt','tools\StayHere.exe','tools\StayHere-README.md') | ForEach-Object { Join-Path $destination $_ }
 $entries = foreach ($path in $files) {
     foreach ($file in @(Get-ChildItem -LiteralPath $path -File -Recurse)) {
         @{path=$file.FullName.Substring($destination.Length+1).Replace('\','/'); size=$file.Length; sha256=(Get-FileHash -LiteralPath $file.FullName -Algorithm SHA256).Hash.ToLowerInvariant()}
@@ -22,7 +26,16 @@ $manifest=Join-Path $destination 'release-files.json'
 @{schema=1; version=$version; files=@($entries)} | ConvertTo-Json -Depth 4 | Set-Content -LiteralPath $manifest -Encoding utf8
 $files += $manifest
 $archive = Join-Path $root 'dist\KSwitcher-win-x64.zip'
-Compress-Archive -LiteralPath $files -DestinationPath $archive -Force
+# Archive only manifest-listed files, preserving relative paths. Never sweep up
+# personal utilities or leftover developer files from the staging directory.
+Add-Type -AssemblyName System.IO.Compression.FileSystem
+$stream = [IO.File]::Open($archive,[IO.FileMode]::Create)
+$zip = [IO.Compression.ZipArchive]::new($stream,[IO.Compression.ZipArchiveMode]::Create)
+try {
+    foreach ($name in @($entries | ForEach-Object { $_.path }) + @('release-files.json')) {
+        [IO.Compression.ZipFileExtensions]::CreateEntryFromFile($zip,(Join-Path $destination $name),$name,[IO.Compression.CompressionLevel]::Optimal) | Out-Null
+    }
+} finally { $zip.Dispose(); $stream.Dispose() }
 Get-FileHash -LiteralPath $archive -Algorithm SHA256
 if ($PublishRelease) {
     $release = Join-Path $root 'Release'

resources/app.rc

@@ -9,8 +9,8 @@ IDC_SCREENSHOT_PENCIL CURSOR "icons/lucide/pencil.cur"
 1 RT_MANIFEST "app.manifest"
 201 RCDATA "update.ps1"
 1 VERSIONINFO
- FILEVERSION 0,6,41,0
+ FILEVERSION 0,6,52,0
- PRODUCTVERSION 0,6,41,0
+ PRODUCTVERSION 0,6,52,0
  FILEOS VOS_NT_WINDOWS32
  FILETYPE VFT_APP
 BEGIN
@@ -20,7 +20,7 @@ BEGIN
   BEGIN
    VALUE "FileDescription", "KSwitcher — native keyboard and clipboard utility"
    VALUE "ProductName", "KSwitcher"
-   VALUE "FileVersion", "0.6.41"
+   VALUE "FileVersion", "0.6.52"
   END
  END
  BLOCK "VarFileInfo"

resources/portable-tools-README.txt

@@ -0,0 +1,18 @@
+KSwitcher portable utilities
+
+Put your trusted portable .exe utilities directly in this tools folder,
+beside this README.txt. Right-click the KSwitcher tray icon and open Tools.
+For example: tools/StayHere.exe appears as Tools > StayHere.
+
+The list refreshes each time the tray menu opens. Subfolders and shortcuts
+are not listed. Utilities start only when you choose them, with this folder
+as their working directory. Closing KSwitcher does not close a utility.
+
+StayHere.exe is bundled. Choose Tools > StayHere to start it; it starts
+enabled, prevents automatic sleep, and sends F15 after 3 minutes of inactivity.
+Left-click its tray icon to pause/resume; right-click for Exit. See StayHere-README.md.
+It does not start automatically with KSwitcher or bypass Windows locking.
+
+Add other utilities separately. Updates preserve your own files in this folder;
+bundled StayHere.exe and documentation may be refreshed. Utilities are not
+transferred by settings synchronization.

src/app.cpp

@@ -6,6 +6,7 @@
 #include "configuration.h"
 #include "diagnostics.h"
 #include "paste_probe.h"
+#include "utilities.h"
 #include "screenshot_notifications.h"
 #include <algorithm>
 #include <commctrl.h>
@@ -78,19 +79,40 @@ class Transaction
     mutable bool invalidLogged{};
     unsigned copyNumber{};
     std::wstring adopted;
+    Bytes adoptedFormats;
+    bool trustedContentsObserved{};
     std::unique_ptr<PasteProbe> selectionProof;
     std::wstring provenSelection;
+    bool farSnippet{};
+    size_t farSelectedSteps{};
 
   public:
-    Transaction(App &a, HWND t, uint64_t v) : app(a), target(t), version(v)
+    Transaction(App &a, HWND t, uint64_t v, bool farEditor = false)
+        : app(a), target(t), version(v), farSnippet(farEditor)
     {
         app.suspended = true;
         try
         {
-            expected = GetClipboardSequenceNumber();
+            for (unsigned attempt = 0; ; ++attempt)
-            snapshot.capture(app.window, expected);
+            {
-            if (expected != GetClipboardSequenceNumber())
+                expected = GetClipboardSequenceNumber();
-                throw std::runtime_error("Clipboard changed while taking snapshot");
+                try
+                {
+                    snapshot.capture(app.window, expected);
+                    if (expected != GetClipboardSequenceNumber())
+                        throw std::runtime_error("Clipboard changed while taking snapshot");
+                    break;
+                }
+                catch (...)
+                {
+                    // No selection or clipboard write has happened yet. Recapture
+                    // the latest clipboard after a concurrent publisher settles.
+                    if (attempt >= 2 || !valid() || expected == GetClipboardSequenceNumber())
+                        throw;
+                    diagnosticEvent(L"Snapshot retry: clipboard changed during capture");
+                    Sleep(20);
+                }
+            }
             captured = true;
         }
         catch (...)
@@ -101,6 +123,7 @@ class Transaction
     }
     ~Transaction()
     {
+        if (farSnippet) finishSelection(false);
         if (captured && GetClipboardSequenceNumber() == expected)
             try
             {
@@ -132,9 +155,19 @@ class Transaction
         if (GetClipboardSequenceNumber() != expected)
         {
             auto now = GetClipboardSequenceNumber();
-            if (adopted.empty() || !ownsClipboard(target) || readClipboard(app.window, 32 * 1024 * 1024, ClipboardRead::Selection).text() != adopted ||
+            auto current = readClipboard(app.window, 32 * 1024 * 1024, ClipboardRead::Selection);
-                GetClipboardSequenceNumber() != now)
+            const bool sameContents = selectionClipboardIdentity(current) == adoptedFormats;
+            if (adopted.empty() || (!trustedContentsObserved && !ownsClipboard(target)) ||
+                !sameContents || GetClipboardSequenceNumber() != now)
+            {
+                diagnosticEvent(L"Clipboard check rejected: expectedSequence=" + std::to_wstring(expected) +
+                    L" readSequence=" + std::to_wstring(now) + L" currentSequence=" +
+                    std::to_wstring(GetClipboardSequenceNumber()) + L" owner=" +
+                    std::to_wstring((uintptr_t)GetClipboardOwner()) + L" sameContents=" +
+                    std::to_wstring(sameContents) + L" expectedText=" + diagnosticText(adopted) +
+                    L" currentText=" + diagnosticText(current.text()));
                 throw std::runtime_error("Operation cancelled: another application changed the clipboard");
+            }
             expected = now;
         }
     }
@@ -142,6 +175,8 @@ class Transaction
     {
         check();
         adopted.clear();
+        adoptedFormats.clear();
+        trustedContentsObserved = false;
         // These are temporary transaction contents, not a user's clipboard entry.
         // In particular, do not invite the Windows history service to read our
         // sentinel while the target editor is trying to open the clipboard.
@@ -164,11 +199,13 @@ class Transaction
         const auto number = ++copyNumber;
         if (!valid())
             return {};
-        write(textClip(L"\x2063KSwitcher-" + std::to_wstring(GetTickCount64())));
+        const auto sentinel = L"\x2063KSwitcher-" + std::to_wstring(GetTickCount64());
+        write(textClip(sentinel));
         DWORD before = expected;
         diagnosticEvent(L"Copy begin number=" + std::to_wstring(number) + L" sentinelSequence=" +
-            std::to_wstring(before) + L" target=" + std::to_wstring((uintptr_t)target));
+            std::to_wstring(before) + L" target=" + std::to_wstring((uintptr_t)target) +
-        if (!valid() || !chord(L'C', MOD_CONTROL))
+            L" sentinel=" + diagnosticText(sentinel));
+        if (!valid() || !chord(farSnippet ? VK_INSERT : L'C', MOD_CONTROL))
         {
             diagnosticEvent(L"Copy failed: context changed or simulated Ctrl+C blocked");
             return {};
@@ -179,6 +216,7 @@ class Transaction
         DWORD changed = before;
         ULONGLONG stable = 0;
         bool changedAgain = false;
+        std::optional<Bytes> observedTargetCopy;
         while (GetTickCount64() < deadline)
         {
             if (!valid())
@@ -193,6 +231,18 @@ class Transaction
                 changedAgain |= changed != before;
                 changed = now;
                 stable = GetTickCount64();
+                // Clipboard synchronizers can republish a legitimate copy under
+                // their own HWND. Record provenance before that handoff; an
+                // unobserved or altered foreign copy must still be rejected.
+                if (ownsClipboard(target))
+                {
+                    auto candidate = readClipboard(app.window, 32 * 1024 * 1024, ClipboardRead::Selection);
+                    if (GetClipboardSequenceNumber() == now && ownsClipboard(target) && !candidate.text().empty())
+                    {
+                        observedTargetCopy = selectionClipboardIdentity(candidate);
+                        diagnosticEvent(L"Copy: target-owned selection observed number=" + std::to_wstring(number));
+                    }
+                }
             }
             if (changed != before && GetTickCount64() - stable >= 60)
                 break;
@@ -205,7 +255,7 @@ class Transaction
                 check();
                 if (!valid() || GetClipboardSequenceNumber() != before)
                     return {};
-                if (!chord(L'C', MOD_CONTROL))
+                if (!chord(farSnippet ? VK_INSERT : L'C', MOD_CONTROL))
                     return {};
                 diagnosticEvent(L"Copy retry: clipboard unchanged after Ctrl+C number=" + std::to_wstring(number) +
                     L" attempt=" + std::to_wstring(attempts + 1) + L" elapsedMs=" + std::to_wstring(GetTickCount64() - started));
@@ -224,16 +274,31 @@ class Transaction
                                     L"Copy failed: context changed");
             return {};
         }
-        if ((GetClipboardOwner() ? !ownsClipboard(target) : changedAgain) ||
+        const bool targetOwned = ownsClipboard(target);
-            changed != GetClipboardSequenceNumber())
-            throw std::runtime_error("Operation cancelled: copy did not belong to the target application");
-        expected = changed;
         auto clip = readClipboard(app.window, 32 * 1024 * 1024, ClipboardRead::Selection);
+        const auto formats = selectionClipboardIdentity(clip);
+        const bool verifiedRelay = observedTargetCopy && *observedTargetCopy == formats;
+        if (((GetClipboardOwner() ? !targetOwned : changedAgain) && !verifiedRelay) ||
+            changed != GetClipboardSequenceNumber())
+        {
+            diagnosticEvent(L"Copy rejected: observedTarget=" + std::to_wstring(observedTargetCopy.has_value()) +
+                L" verifiedRelay=" + std::to_wstring(verifiedRelay) + L" expectedSequence=" +
+                std::to_wstring(changed) + L" currentSequence=" + std::to_wstring(GetClipboardSequenceNumber()) +
+                L" owner=" + std::to_wstring((uintptr_t)GetClipboardOwner()) + L" targetText=" +
+                diagnosticText(observedTargetCopy ? decodeClip(*observedTargetCopy).text() : L"") +
+                L" currentText=" + diagnosticText(clip.text()));
+            throw std::runtime_error("Operation cancelled: copy did not belong to the target application");
+        }
+        if (!targetOwned && verifiedRelay)
+            diagnosticEvent(L"Copy: identical target selection republished by clipboard synchronizer");
+        expected = changed;
         auto text = clip.text();
         diagnosticEvent(L"Copy result number=" + std::to_wstring(number) + L" attempts=" +
             std::to_wstring(attempts) + L" elapsedMs=" + std::to_wstring(GetTickCount64() - started) +
             L" text=" + diagnosticText(text));
         adopted = text;
+        adoptedFormats = formats;
+        trustedContentsObserved = targetOwned || verifiedRelay;
         check();
         for (auto &f : clip.formats)
         {
@@ -277,8 +342,44 @@ class Transaction
     bool recoveredSelection() const { return selectionProof != nullptr; }
     bool select(size_t n)
     {
+        if (farSnippet)
+        {
+            if (n > 4096 || farSelectedSteps) return false;
+            for (size_t i = 0; i < n; ++i)
+            {
+                if (!valid() || !chord(VK_LEFT, MOD_ALT | MOD_SHIFT)) return false;
+                ++farSelectedSteps;
+            }
+            return valid();
+        }
         return selectPrevious(n, [&] { return valid(); });
     }
+    bool finishSelection(bool atStart)
+    {
+        if (!farSnippet) return valid() && chord(atStart ? VK_LEFT : VK_RIGHT);
+        if (!farSelectedSteps) return valid();
+        if (atStart)
+        {
+            // Far arrows move one character, rather than collapsing a selection
+            // to its edge. Move into the nonempty selected range and back.
+            if (!valid() || !chord(VK_RIGHT)) return false;
+            farSelectedSteps = 0;
+            return valid() && chord(VK_LEFT);
+        }
+        while (farSelectedSteps && valid())
+        {
+            if (!chord(VK_RIGHT, MOD_ALT | MOD_SHIFT)) return false;
+            --farSelectedSteps;
+        }
+        return !farSelectedSteps && valid();
+    }
+    std::optional<std::wstring> readFarSnippet(size_t count)
+    {
+        if (!farSnippet || !count || !select(count)) return {};
+        auto observed = copy();
+        if (!finishSelection(false) || observed.empty()) return {};
+        return observed;
+    }
     std::wstring copyRange(size_t count, const std::wstring &wordCandidate,
                            const std::function<bool(const std::wstring &)> &matches,
                            const std::function<bool(const std::wstring &)> &suffixMatches = {})
@@ -359,6 +460,14 @@ class Transaction
         if (!valid())
             return false;
         write(clip);
+        // Our verified payload is also trusted across an identical relay. The
+        // sentinel written by copy() deliberately does not get this allowance.
+        if (clip.formats.size() == 1 && clip.formats.front().id == CF_UNICODETEXT)
+        {
+            adopted = clip.text();
+            adoptedFormats = selectionClipboardIdentity(clip);
+            trustedContentsObserved = true;
+        }
         // Viber's Qt editor observes clipboard changes asynchronously. Give it
         // a chance to discard the data object from Ctrl+C before requesting paste.
         // Recheck ownership and input below; never retry a possibly applied paste.
@@ -373,9 +482,16 @@ class Transaction
             if (!valid())
                 return false;
         }
-        if (!chord(L'V', MOD_CONTROL))
+        if (!chord(farSnippet ? VK_INSERT : L'V', farSnippet ? MOD_SHIFT : MOD_CONTROL))
             throw std::runtime_error("Windows blocked simulated input; check application privilege levels");
+        // The selected trigger was replaced. Do not restore its old caret range
+        // if clipboard verification below subsequently rejects a concurrent copy.
+        if (farSnippet) farSelectedSteps = 0;
         Sleep(300);
+        // A clipboard synchronizer may replace our payload after Ctrl+V is
+        // queued but before the editor consumes it. Do not run snippet actions
+        // (especially Enter) after such a race.
+        check();
         return true;
     }
     bool nativeSelectionIs(const std::wstring &original) const
@@ -443,6 +559,7 @@ App::App(HINSTANCE h, bool test, const std::filesystem::path &dataRoot, HWND ser
 }
 App::~App()
 {
+    stopBrowserChatMonitor();
     if (auto host = historyController(historyProcess)) PostMessageW(host, WM_CLOSE, 0, 0);
     if (historyProcess) CloseHandle(historyProcess);
     if (notificationRegistration) CloseHandle(notificationRegistration);
@@ -802,9 +919,12 @@ void App::keyboard(const KBDLLHOOKSTRUCT &k, UINT mods)
     if (busy || settings.snippets.empty())
         return;
     auto keys = lower(run.keys);
+    auto snippetProcess = processName(fg);
+    for (int priority : {2, 1})
     for (size_t i = 0; i < settings.snippets.size(); ++i)
     {
         auto &sn = settings.snippets[i];
+        if (snippetAppPriority(sn, snippetProcess) != priority) continue;
         std::vector<std::wstring> variants{lower(sn.trigger)};
         for (auto &l : layouts)
         {
@@ -842,6 +962,32 @@ void App::keyboard(const KBDLLHOOKSTRUCT &k, UINT mods)
             }
     }
 }
+void App::refreshChatContext()
+{
+    HWND target = GetForegroundWindow();
+    chatWindow = target;
+    activeChatTitle = chatTitle(target);
+    activeChat = settings.chatCycles.empty() ? L"" : windowChatKey(target);
+}
+void App::switchChatLayout(bool reverse)
+{
+    HWND target = chatWindow;
+    auto key = activeChat;
+    if (!target || target != GetForegroundWindow() || key.empty() || windowChatKey(target) != key ||
+        !settings.chatCycles.contains(key) || busy.exchange(true)) return;
+    auto cycle = chatCycle(settings, key, layouts);
+    auto available = layouts;
+    resetInput();
+    enqueue([this, target, key, cycle, available, reverse]
+    {
+        struct Reset { std::atomic<bool> &busy; ~Reset() { busy = false; } } reset{busy};
+        auto valid = [&] { return GetForegroundWindow() == target && windowChatKey(target) == key; };
+        if (key.starts_with(L"telegram-web\n") && readChromeChat(target) != key) return;
+        if (!valid()) return;
+        auto next = nextChatLayout(cycle, available, windowLayout(target), reverse);
+        if (next) switchWindowLayout(target, next, valid);
+    });
+}
 bool App::handleKeyboard(const KBDLLHOOKSTRUCT &key, bool down, UINT mods)
 {
     // Filter before capture, hotkey latching and typing history. External injected
@@ -892,6 +1038,23 @@ bool App::handleKeyboard(const KBDLLHOOKSTRUCT &key, bool down, UINT mods)
             return 1; // Record the chord without executing a global shortcut or typing into an editor.
         }
     }
+    bool chatEnabled = false;
+    if (down && ChatSwitchHook::candidate(key.vkCode, mods) && !settings.chatCycles.empty() &&
+        !isHotkey(key.vkCode, mods))
+    {
+        refreshChatContext();
+        chatEnabled = !activeChat.empty() && settings.chatCycles.contains(activeChat);
+    }
+    const int chatAction = chatSwitchHook.update(key.vkCode, down, mods, chatEnabled);
+    if (chatAction)
+    {
+        if (chatAction > 0)
+        {
+            chord(0xE8); // Suppress the shell's bare Alt/Win action.
+            switchChatLayout(chatAction == 2); // Captures this chat before another keyboard event.
+        }
+        return true;
+    }
     if (down)
     {
         auto action = hotkeyHook.update(key.vkCode, true, mods, hookBindings);
@@ -955,6 +1118,15 @@ void App::replayTyping()
 }
 LRESULT CALLBACK App::keyProc(int code, WPARAM wp, LPARAM lp)
 {
+    // MWB suppresses source-machine events that it forwards elsewhere. Let
+    // downstream hooks route the event before tracking it or starting a snippet.
+    // Call the chain exactly once; a local event can still be consumed below.
+    const auto routed = CallNextHookEx(nullptr, code, wp, lp);
+    return keyboardAfterHooks(code, wp, lp, routed);
+}
+LRESULT App::keyboardAfterHooks(int code, WPARAM wp, LPARAM lp, LRESULT routed)
+{
+    if (routed) return routed;
     if (code == HC_ACTION && current &&
         (wp == WM_KEYDOWN || wp == WM_SYSKEYDOWN || wp == WM_KEYUP || wp == WM_SYSKEYUP))
     {
@@ -969,7 +1141,7 @@ LRESULT CALLBACK App::keyProc(int code, WPARAM wp, LPARAM lp)
                                     wp == WM_KEYDOWN || wp == WM_SYSKEYDOWN, mods))
             return 1;
     }
-    return CallNextHookEx(nullptr, code, wp, lp);
+    return routed;
 }
 LRESULT CALLBACK App::mouseProc(int code, WPARAM wp, LPARAM lp)
 {
@@ -1090,8 +1262,9 @@ void App::transform(int command, int snippet)
         available = layouts;
         version = inputVersion;
     }
+    const auto requestedChat = config.chatCycles.empty() ? L"" : windowChatKey(target);
     enqueue(
-        [this, target, recent, previous, config, available, version, command, snippet, attempt, manual, requestedAt, preDeferred]
+        [this, target, recent, previous, config, available, version, command, snippet, attempt, manual, requestedAt, preDeferred, requestedChat]() mutable
         {
             struct BusyReset
             {
@@ -1106,6 +1279,9 @@ void App::transform(int command, int snippet)
                         b = false;
                 }
             } reset{busy, window, preDeferred};
+            auto effectiveChat = requestedChat;
+            if (lower(processName(target)) == L"chrome") effectiveChat = readChromeChat(target);
+            config.cycle = chatCycle(config, effectiveChat, available);
             auto start = GetTickCount64();
             std::wstring reason = L"cancelled-before-selection";
             std::wstring text, result, expected, actual, verification = L"not-attempted";
@@ -1213,14 +1389,16 @@ void App::transform(int command, int snippet)
                 }
                 // Collapse a temporary selection on every failed auto-correction,
                 // including clipboard exceptions, before queued typing is replayed.
+                const bool farSnippet = snippet >= 0 && lower(processName(target)) == L"far";
                 bool autoSelected = false;
                 struct SelectionReset
                 {
                     bool &selected;
                     std::function<bool()> valid;
-                    ~SelectionReset() { if (selected && valid()) chord(VK_RIGHT); }
+                    bool farEditor;
-                } selectionReset{autoSelected, valid};
+                    ~SelectionReset() { if (selected && !farEditor && valid()) chord(VK_RIGHT); }
-                Transaction tx(*this, target, version);
+                } selectionReset{autoSelected, valid, farSnippet};
+                Transaction tx(*this, target, version, farSnippet);
                 reason = L"selection-unavailable";
                 diagnosticEvent(L"Transform target=" + processName(target) + L" command=" + std::to_wstring(command) +
                     L" recent=" + std::to_wstring(config.recent) + L" keys=" +
@@ -1298,8 +1476,18 @@ void App::transform(int command, int snippet)
                     if (snippet >= (int)config.snippets.size() || recent.window != target)
                         return;
                     const auto &sn = config.snippets[snippet];
+                    if (!snippetAppPriority(sn, processName(target))) return;
                     if (recent.keys.size() < sn.trigger.size())
                         return;
+                    result = parseTemplate(sn.text).text;
+                    // A multiline clipboard paste can execute a console command
+                    // before readback. Only explicit, verified {enter} may do so.
+                    if (farSnippet && (result.empty() || result.find_first_of(L"\r\n") != result.npos ||
+                                       caretSteps(result) > 4096))
+                    {
+                        reason = L"far-snippet-template-unsupported";
+                        return;
+                    }
                     Run tail = recent;
                     tail.keys = tail.keys.substr(tail.keys.size() - sn.trigger.size());
                     if (!tx.select(sn.trigger.size()))
@@ -1309,7 +1497,6 @@ void App::transform(int command, int snippet)
                     text = tx.copy();
                     if (tail.match(text, available, physicalLayout()) < 0)
                         return;
-                    result = parseTemplate(sn.text).text;
                     automatic = true;
                 }
                 else if (config.recent && recent.window == target && !recent.keys.empty() && !recent.overflow)
@@ -1385,9 +1572,9 @@ void App::transform(int command, int snippet)
                                 for (int i = 0; i < (int)available.size(); ++i)
                                     if (available[i].id == id && available[i].convertible)
                                         cycle.push_back(i);
-                            if (cycle.size() < 2)
+                            if (cycle.empty())
                             {
-                                reason = L"cycle-has-fewer-than-two-layouts";
+                                reason = L"cycle-has-no-layouts";
                                 if (automatic && tx.valid())
                                     chord(VK_RIGHT);
                                 return;
@@ -1398,11 +1585,12 @@ void App::transform(int command, int snippet)
                     }
                 }
                 bool sent = false;
-                const bool requireReadback = tx.recoveredSelection();
+                const bool requireReadback = tx.recoveredSelection() || snippet >= 0;
-                PasteProbe probe(((config.writeLog && manual) || requireReadback) && result != text, text, target);
+                PasteProbe probe(!farSnippet && ((config.writeLog && manual) || requireReadback) && result != text, text, target);
-                if (requireReadback && result != text && probe.status != L"ready")
+                if (requireReadback && !farSnippet && result != text && probe.status != L"ready")
                 {
-                    reason = L"recovered-selection-unavailable";
+                    verification = probe.status;
+                    reason = snippet >= 0 ? L"snippet-verification-unavailable" : L"recovered-selection-unavailable";
                     std::lock_guard lock(stateMutex);
                     last.reset();
                     run.reset();
@@ -1413,10 +1601,10 @@ void App::transform(int command, int snippet)
                 if (result != text)
                     sent = tx.paste(textClip(result));
                 else if (automatic && tx.valid())
-                    chord(VK_RIGHT);
+                    tx.finishSelection(false);
                 if (requireReadback && result != text && !sent)
                 {
-                    reason = L"recovered-selection-paste-cancelled";
+                    reason = snippet >= 0 ? L"snippet-paste-cancelled" : L"recovered-selection-paste-cancelled";
                     std::lock_guard lock(stateMutex);
                     last.reset();
                     run.reset();
@@ -1436,11 +1624,12 @@ void App::transform(int command, int snippet)
                     verification = probe.status;
                     if (tx.valid())
                     {
-                        auto observed = probe.read((int)caretSteps(result));
+                        auto observed = farSnippet ? tx.readFarSnippet(caretSteps(result)) :
+                                                     probe.read((int)caretSteps(result));
                         // A native Edit may silently ignore Ctrl+V while the clipboard is busy.
                         // Retry once only with fresh native proof that the exact original range
                         // is still selected. Never retry an unknown or changed editor state.
-                        if (observed && newlines(*observed) == newlines(text) && tx.nativeSelectionIs(text))
+                        if (!farSnippet && observed && newlines(*observed) == newlines(text) && tx.nativeSelectionIs(text))
                         {
                             diagnosticEvent(L"Paste retry: native Edit still selects the unchanged original");
                             if (tx.paste(textClip(result)) && tx.valid())
@@ -1448,7 +1637,8 @@ void App::transform(int command, int snippet)
                             else
                                 observed.reset();
                         }
-                        verification = probe.status;
+                        verification = farSnippet ? (observed ? L"read-back-via-far-clipboard" :
+                                                                 L"far-readback-unavailable") : probe.status;
                         if (observed && tx.valid())
                         {
                             actual = *observed;
@@ -1492,6 +1682,7 @@ void App::transform(int command, int snippet)
                 }
                 if (snippet >= 0 && sent && tx.valid())
                 {
+                    tx.check();
                     auto t = parseTemplate(config.snippets[snippet].text);
                     if (!t.suffix.empty())
                     {
@@ -1500,15 +1691,18 @@ void App::transform(int command, int snippet)
                         if (!tx.valid()) return;
                         if (newlines(suffix) != newlines(t.suffix))
                         {
-                            chord(VK_RIGHT);
+                            tx.finishSelection(false);
                             return;
                         }
-                        if (!chord(VK_LEFT)) return;
+                        if (!tx.finishSelection(true)) return;
                     }
                     // Action markers run after insertion and cursor placement,
                     // before any physical typing buffered during expansion.
                     for (int i = 0; i < t.enters && tx.valid(); ++i)
+                    {
+                        tx.check();
                         if (!chord(VK_RETURN)) break;
+                    }
                 }
                 if (to >= 0 && config.switchLayout && tx.valid() && (sent || result == text))
                 {
@@ -1680,6 +1874,10 @@ void App::recognizeEntry(std::wstring id)
 }
 void App::trayMenu()
 {
+    constexpr int utilityCommandBase = 1000;
+    std::error_code utilitiesError;
+    auto utilities = discoverUtilities(std::filesystem::path(executable()).parent_path() / L"tools", utilitiesError);
+    if (utilities.size() > 50000) utilities.resize(50000);
     HMENU menu = CreatePopupMenu();
     AppendMenuW(menu, MF_STRING, 10, L"Clipboard &history");
     AppendMenuW(menu, MF_STRING, 24, L"&Capture screen region…");
@@ -1687,6 +1885,13 @@ void App::trayMenu()
     SetMenuDefaultItem(menu, 11, FALSE);
     AppendMenuW(menu, MF_STRING, 12, L"S&nippets…");
     AppendMenuW(menu, MF_STRING, 13, L"&Keyboard shortcuts…");
+    HMENU utilityMenu = CreatePopupMenu();
+    for (size_t i = 0; i < utilities.size(); ++i)
+        AppendMenuW(utilityMenu, MF_STRING, utilityCommandBase + i, utilityMenuLabel(utilities[i]).c_str());
+    if (utilities.empty())
+        AppendMenuW(utilityMenu, MF_STRING | MF_GRAYED, 0,
+                    utilitiesError ? L"Cannot read tools folder" : L"No utilities in tools folder");
+    AppendMenuW(menu, MF_POPUP, (UINT_PTR)utilityMenu, L"&Tools");
     AppendMenuW(menu, MF_SEPARATOR, 0, nullptr);
     AppendMenuW(menu, MF_STRING | (settings.awake ? MF_CHECKED : 0), 14, L"Keep screen a&wake");
     HMENU pause = CreatePopupMenu();
@@ -1713,6 +1918,20 @@ void App::trayMenu()
     PostMessageW(window, WM_NULL, 0, 0);
     try
     {
+        if (cmd >= utilityCommandBase && size_t(cmd - utilityCommandBase) < utilities.size())
+        {
+            const auto &path = utilities[cmd - utilityCommandBase];
+            auto command = L"\"" + path.wstring() + L"\"";
+            STARTUPINFOW startup{sizeof(startup)};
+            PROCESS_INFORMATION process{};
+            if (!CreateProcessW(path.c_str(), command.data(), nullptr, nullptr, FALSE, 0, nullptr,
+                                path.parent_path().c_str(), &startup, &process))
+                throw std::runtime_error(utf8(lastError(L"Cannot start utility " + path.filename().wstring())));
+            AllowSetForegroundWindow(process.dwProcessId);
+            CloseHandle(process.hThread);
+            CloseHandle(process.hProcess);
+            return;
+        }
         switch (cmd)
         {
         case 24:
@@ -1900,7 +2119,9 @@ LRESULT CALLBACK App::windowProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
         app->replayTyping();
         return 0;
     case TrayMessage:
-        if (LOWORD(lp) == WM_CONTEXTMENU)
+        if (LOWORD(lp) == NIN_BALLOONUSERCLICK)
+            showLogs(*app);
+        else if (LOWORD(lp) == WM_CONTEXTMENU)
             app->trayMenu();
         else if (LOWORD(lp) == WM_LBUTTONDBLCLK)
             // The shell still owns the mouse gesture on the second button-down.
@@ -2104,6 +2325,7 @@ int App::execute()
     // Resume pending OCR, including older images without a saved OCR state.
     scheduleHistoryOcr(settings);
     addTray();
+    if (!smoke) startBrowserChatMonitor();
     SetTimer(window, 1, 60000, nullptr);
     if (!smoke) SetTimer(window, 6, 1000, nullptr);
     SetThreadExecutionState(ES_CONTINUOUS |

src/app.h

@@ -3,6 +3,7 @@
 #include "storage.h"
 #include "update.h"
 #include "sync.h"
+#include "chat_context.h"
 #include <atomic>
 #include <condition_variable>
 #include <deque>
@@ -134,6 +135,11 @@ class App
     int previousAttemptCommand{}, repeatAttempts{};
     std::vector<std::pair<int, Hotkey>> hookBindings;
     HotkeyHook hotkeyHook;
+    ChatSwitchHook chatSwitchHook;
+    HWND chatWindow{};
+    std::wstring activeChat, activeChatTitle;
+    void refreshChatContext();
+    void switchChatLayout(bool reverse);
     HWND typingTarget{};
     bool autoPending{};
     int snippetPending = -1;
@@ -143,6 +149,7 @@ class App
     void replayTyping();
     static LRESULT CALLBACK windowProc(HWND, UINT, WPARAM, LPARAM);
     static LRESULT CALLBACK keyProc(int, WPARAM, LPARAM);
+    static LRESULT keyboardAfterHooks(int, WPARAM, LPARAM, LRESULT);
     static LRESULT CALLBACK mouseProc(int, WPARAM, LPARAM);
 };
 void showHistory(App &, bool visible = true);

src/autocorrect.cpp

@@ -257,7 +257,7 @@ std::optional<AutoSuggestion> AutoCorrector::suggest(const std::wstring &typed,
     {
         auto replacement = settings.autoReplacements.find(small);
         if (replacement != settings.autoReplacements.end() &&
-            replacement->second.find_first_not_of(alphabet) == small.npos)
+            replacement->second.find_first_not_of(alphabet + L" ") == small.npos)
             return sameLayout(replacement->second);
     }
     auto personal = [&](const std::wstring &language, const std::wstring &candidate)

src/browser_chat.inc

@@ -0,0 +1,143 @@
+// Chrome Telegram Web integration: native accessibility, no OCR or polling timer.
+#include "chat_context.h"
+#include <uiautomation.h>
+#include <atomic>
+#include <thread>
+namespace ks {
+namespace {
+template<class T> struct BrowserCom {
+ T *p{}; ~BrowserCom(){if(p)p->Release();}
+ T** out(){return &p;} T* operator->(){return p;}
+};
+std::wstring browserString(IUIAutomationElement* e, PROPERTYID id) {
+ VARIANT v;VariantInit(&v);std::wstring s;
+ if(SUCCEEDED(e->GetCurrentPropertyValue(id,&v)) && v.vt==VT_BSTR && v.bstrVal) s.assign(v.bstrVal,SysStringLen(v.bstrVal));
+ VariantClear(&v);return s;
+}
+struct ChromeElements { BrowserCom<IUIAutomationElement> address,document,header; int addresses{},documents{}; };
+void findChromeElements(IUIAutomationTreeWalker* walker,IUIAutomationElement* e,ChromeElements& found,int depth,int& budget) {
+ if(depth>12 || --budget<0)return;
+ CONTROLTYPEID type{};BOOL offscreen=TRUE;e->get_CurrentControlType(&type);e->get_CurrentIsOffscreen(&offscreen);
+ if(type==UIA_DocumentControlTypeId){
+  if(!offscreen && browserString(e,UIA_AutomationIdPropertyId)==L"RootWebArea"){
+   if(++found.documents==1){e->AddRef();found.document.p=e;}}
+  return; // Never traverse message content.
+ }
+ if(type==UIA_EditControlTypeId && !offscreen && browserString(e,UIA_ClassNamePropertyId)==L"OmniboxViewViews"){
+  if(++found.addresses==1){e->AddRef();found.address.p=e;}}
+ BrowserCom<IUIAutomationElement> child;walker->GetFirstChildElement(e,child.out());
+ while(child.p && budget>0){findChromeElements(walker,child.p,found,depth+1,budget);BrowserCom<IUIAutomationElement> next;walker->GetNextSiblingElement(child.p,next.out());child.p->Release();child.p=next.p;next.p=nullptr;}
+}
+IUIAutomationElement* chromeHeader(IUIAutomationTreeWalker* walker,IUIAutomationElement* document) {
+ // Web K's center pane is separate from its chat list and message history.
+ std::function<IUIAutomationElement*(IUIAutomationElement*,int)> center;
+ center=[&](IUIAutomationElement* e,int depth)->IUIAutomationElement* {
+  if(depth>3)return nullptr;
+  if(browserString(e,UIA_AutomationIdPropertyId)==L"column-center"){e->AddRef();return e;}
+  auto id=browserString(e,UIA_AutomationIdPropertyId);if(id==L"column-left"||id==L"column-right")return nullptr;
+  BrowserCom<IUIAutomationElement> c;walker->GetFirstChildElement(e,c.out());int limit=12;
+  while(c.p && --limit>0){if(auto result=center(c.p,depth+1))return result;BrowserCom<IUIAutomationElement> next;walker->GetNextSiblingElement(c.p,next.out());c.p->Release();c.p=next.p;next.p=nullptr;}return nullptr;
+ };
+ BrowserCom<IUIAutomationElement> pane;pane.p=center(document,0);if(!pane.p)return nullptr;
+ BrowserCom<IUIAutomationElement> header;walker->GetFirstChildElement(pane.p,header.out());if(!header.p)return nullptr;
+ BrowserCom<IUIAutomationElement> c;walker->GetFirstChildElement(header.p,c.out());int limit=16,buttons=0;IUIAutomationElement* title{};
+ while(c.p && --limit>0){CONTROLTYPEID type{};c->get_CurrentControlType(&type);if(type==UIA_ButtonControlTypeId)++buttons;
+  if(type==UIA_TextControlTypeId && !title){title=c.p;title->AddRef();}
+  BrowserCom<IUIAutomationElement> next;walker->GetNextSiblingElement(c.p,next.out());c.p->Release();c.p=next.p;next.p=nullptr;}
+ if(buttons<2 && title){title->Release();title=nullptr;}return title;
+}
+std::wstring chromeTitleKey(IUIAutomationElement* header){
+ if(!header)return {};
+ auto name=browserString(header,UIA_NamePropertyId);
+ if(name.empty()||name.size()>512||name.find_first_of(L"\r\n")!=name.npos)return {};
+ return L"telegram-web\n"+name;
+}
+std::wstring chromeSnapshot(IUIAutomation* uia,HWND window,ChromeElements& found) {
+ if(!IsWindow(window)||IsIconic(window)||lower(processName(window))!=L"chrome")return {};
+ BrowserCom<IUIAutomationElement> root;BrowserCom<IUIAutomationTreeWalker> walker;
+ if(FAILED(uia->ElementFromHandle(window,root.out()))||!root.p||FAILED(uia->get_ControlViewWalker(walker.out())))return {};
+ int budget=250;findChromeElements(walker.p,root.p,found,0,budget);
+ if(found.addresses!=1||found.documents!=1)return {};
+ auto address=telegramWebKey(browserString(found.address.p,UIA_ValueValuePropertyId));
+ auto document=telegramWebKey(browserString(found.document.p,UIA_ValueValuePropertyId));
+ BOOL editing=FALSE;found.address->get_CurrentHasKeyboardFocus(&editing);
+ if(editing || address.empty() || address!=document)return {};
+ found.header.p=chromeHeader(walker.p,found.document.p);
+ return chromeTitleKey(found.header.p);
+}
+std::mutex browserMutex;
+HWND browserWindow{};std::wstring browserKey;
+std::atomic<DWORD> browserThreadId{};
+std::atomic<bool> browserPending{}, browserStopping{};
+std::thread browserThread;
+void invalidateBrowser(){std::lock_guard lock(browserMutex);browserKey.clear();}
+void requestBrowser(){invalidateBrowser();auto id=browserThreadId.load();if(id && !browserPending.exchange(true))PostThreadMessageW(id,WM_APP+61,0,0);}
+void CALLBACK browserForeground(HWINEVENTHOOK,DWORD,HWND,LONG,LONG,DWORD,DWORD){requestBrowser();}
+class BrowserChanged final: public IUIAutomationPropertyChangedEventHandler {
+ std::atomic<ULONG> refs{1};
+ public:
+ HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid,void** out) override {if(!out)return E_POINTER;*out=nullptr;if(iid==IID_IUnknown||iid==IID_IUIAutomationPropertyChangedEventHandler){*out=static_cast<IUIAutomationPropertyChangedEventHandler*>(this);AddRef();return S_OK;}return E_NOINTERFACE;}
+ ULONG STDMETHODCALLTYPE AddRef() override{return ++refs;}
+ ULONG STDMETHODCALLTYPE Release() override{auto n=--refs;if(!n)delete this;return n;}
+ HRESULT STDMETHODCALLTYPE HandlePropertyChangedEvent(IUIAutomationElement*,PROPERTYID,VARIANT) override {requestBrowser();return S_OK;}
+};
+}
+std::wstring readChromeChat(HWND window) {
+ auto hr=CoInitializeEx(nullptr,COINIT_MULTITHREADED);
+ struct Apartment{bool own;~Apartment(){if(own)CoUninitialize();}} apartment{SUCCEEDED(hr)};
+ BrowserCom<IUIAutomation2> uia;
+ if(FAILED(CoCreateInstance(CLSID_CUIAutomation8,nullptr,CLSCTX_INPROC_SERVER,IID_IUIAutomation2,(void**)uia.out())))return {};
+ uia->put_ConnectionTimeout(150);uia->put_TransactionTimeout(150);
+ ChromeElements elements;return chromeSnapshot(uia.p,window,elements);
+}
+std::wstring cachedChromeChat(HWND window){std::lock_guard lock(browserMutex);return window==browserWindow?browserKey:L"";}
+void startBrowserChatMonitor(){
+ if(browserThread.joinable())return;
+ browserStopping=false;
+ browserThread=std::thread([] {
+  CoInitializeEx(nullptr,COINIT_MULTITHREADED);MSG message{};PeekMessageW(&message,nullptr,0,0,PM_NOREMOVE);
+  browserThreadId=GetCurrentThreadId();
+  auto foreground=SetWinEventHook(EVENT_SYSTEM_FOREGROUND,EVENT_SYSTEM_FOREGROUND,nullptr,browserForeground,0,0,WINEVENT_OUTOFCONTEXT);
+  // Focus changes cover tab selection and entering/leaving the address bar.
+  auto focus=SetWinEventHook(EVENT_OBJECT_FOCUS,EVENT_OBJECT_FOCUS,nullptr,browserForeground,0,0,WINEVENT_OUTOFCONTEXT);
+  BrowserCom<IUIAutomation2> uia;CoCreateInstance(CLSID_CUIAutomation8,nullptr,CLSCTX_INPROC_SERVER,IID_IUIAutomation2,(void**)uia.out());
+  BrowserCom<IUIAutomationElement> address,document,header;BrowserCom<BrowserChanged> handler;handler.p=new BrowserChanged;
+  if(uia.p){uia->put_ConnectionTimeout(150);uia->put_TransactionTimeout(150);}
+  requestBrowser();
+  if(browserStopping)PostThreadMessageW(GetCurrentThreadId(),WM_QUIT,0,0);
+  while(GetMessageW(&message,nullptr,0,0)>0){
+   if(message.message!=WM_APP+61){TranslateMessage(&message);DispatchMessageW(&message);continue;}
+   browserPending=false;
+   if(!uia.p)continue;
+   if(address.p){uia->RemovePropertyChangedEventHandler(address.p,handler.p);address.p->Release();address.p=nullptr;}
+   if(document.p){uia->RemovePropertyChangedEventHandler(document.p,handler.p);document.p->Release();document.p=nullptr;}
+   if(header.p){uia->RemovePropertyChangedEventHandler(header.p,handler.p);header.p->Release();header.p=nullptr;}
+   auto window=GetForegroundWindow();ChromeElements elements;auto key=chromeSnapshot(uia.p,window,elements);
+   PROPERTYID properties[]={UIA_ValueValuePropertyId};
+   bool subscribed=elements.address.p && elements.document.p;
+   if(subscribed){address.p=elements.address.p;elements.address.p=nullptr;document.p=elements.document.p;elements.document.p=nullptr;
+    subscribed=SUCCEEDED(uia->AddPropertyChangedEventHandlerNativeArray(address.p,TreeScope_Element,nullptr,handler.p,properties,1));
+    subscribed=SUCCEEDED(uia->AddPropertyChangedEventHandlerNativeArray(document.p,TreeScope_Element,nullptr,handler.p,properties,1)) && subscribed;
+    if(elements.header.p){header.p=elements.header.p;elements.header.p=nullptr;PROPERTYID nameProperty=UIA_NamePropertyId;
+     subscribed=SUCCEEDED(uia->AddPropertyChangedEventHandlerNativeArray(header.p,TreeScope_Element,nullptr,handler.p,&nameProperty,1)) && subscribed;}
+    // Close the read/subscribe race without scanning the content tree.
+    key=telegramWebKey(browserString(address.p,UIA_ValueValuePropertyId));
+    if(key.empty() || key!=telegramWebKey(browserString(document.p,UIA_ValueValuePropertyId)))key.clear();
+    else key=chromeTitleKey(header.p);
+    BOOL editing=FALSE;address->get_CurrentHasKeyboardFocus(&editing);if(editing)key.clear();
+   }
+   std::lock_guard lock(browserMutex);browserWindow=window;browserKey=subscribed && !browserPending && window==GetForegroundWindow()?key:L"";
+  }
+  browserThreadId=0;
+  if(foreground)UnhookWinEvent(foreground);
+  if(focus)UnhookWinEvent(focus);
+  if(uia.p){if(header.p)uia->RemovePropertyChangedEventHandler(header.p,handler.p);if(address.p)uia->RemovePropertyChangedEventHandler(address.p,handler.p);if(document.p)uia->RemovePropertyChangedEventHandler(document.p,handler.p);}
+  invalidateBrowser();
+  // COM objects release before uninitializing the apartment below.
+  if(header.p){header.p->Release();header.p=nullptr;}
+  if(address.p){address.p->Release();address.p=nullptr;}if(document.p){document.p->Release();document.p=nullptr;}
+  if(uia.p){uia.p->Release();uia.p=nullptr;}CoUninitialize();
+ });
+}
+void stopBrowserChatMonitor(){browserStopping=true;auto id=browserThreadId.load();if(id)PostThreadMessageW(id,WM_QUIT,0,0);if(browserThread.joinable())browserThread.join();browserPending=false;}
+}

src/chat_context.h

@@ -0,0 +1,119 @@
+#pragma once
+#include "platform.h"
+#include <algorithm>
+
+namespace ks
+{
+inline std::wstring telegramWebKey(std::wstring url)
+{
+    if (url.starts_with(L"https://")) url.erase(0, 8);
+    const std::wstring host = L"web.telegram.org/";
+    if (!url.starts_with(host)) return {};
+    url.erase(0, host.size());
+    if (!(url.starts_with(L"k/#") || url.starts_with(L"a/#"))) return {};
+    auto peer = url.substr(3);
+    if (peer.empty() || peer.size() > 128) return {};
+    if (peer.front() == L'@')
+    {
+        peer = lower(peer);
+        if (peer.size() < 2 || peer.find_first_not_of(L"abcdefghijklmnopqrstuvwxyz0123456789_", 1) != peer.npos) return {};
+    }
+    else
+    {
+        auto first = peer.front() == L'-' ? 1u : 0u;
+        if (first == peer.size() || peer.find_first_not_of(L"0123456789", first) != peer.npos) return {};
+    }
+    return L"telegram-web\n" + peer;
+}
+std::wstring readChromeChat(HWND);
+std::wstring cachedChromeChat(HWND);
+void startBrowserChatMonitor();
+void stopBrowserChatMonitor();
+struct ChatSwitchHook
+{
+    bool pressed[256]{};
+    static bool candidate(UINT key, UINT mods)
+    {
+        bool shift = key == VK_SHIFT || key == VK_LSHIFT || key == VK_RSHIFT;
+        bool alt = key == VK_MENU || key == VK_LMENU || key == VK_RMENU;
+        return (key == VK_SPACE && (mods == MOD_WIN || mods == (MOD_WIN | MOD_SHIFT))) ||
+            (shift && mods == MOD_ALT) || (alt && mods == MOD_SHIFT);
+    }
+    // 1 forward, 2 backward, -1 consumed repeat/release, 0 ordinary input.
+    int update(UINT key, bool down, UINT mods, bool enabled)
+    {
+        if (key >= 256) return 0;
+        if (pressed[key]) { if (!down) pressed[key] = false; return -1; }
+        if (!down || !enabled) return 0;
+        if (!candidate(key, mods)) return 0;
+        pressed[key] = true;
+        return key == VK_SPACE && (mods & MOD_SHIFT) ? 2 : 1;
+    }
+};
+inline std::wstring chatTitle(HWND window)
+{
+    wchar_t title[1024]{};
+    if (!window) return {};
+    int length = GetWindowTextW(window, title, std::size(title));
+    if (!length || length >= (int)std::size(title) - 1) return {};
+    return title;
+}
+inline std::wstring chatKey(std::wstring process, std::wstring title)
+{
+    process = lower(process);
+    if (process.ends_with(L".exe")) process.resize(process.size() - 4);
+    while (!title.empty() && (title.front() == 0x200e || title.front() == 0x200f)) title.erase(0, 1);
+    if (process == L"telegram")
+    {
+        // Telegram's unread badge is not part of the contact name.
+        auto badge = title.rfind(L" \u2013 (");
+        if (badge != title.npos && title.back() == L')')
+        {
+            auto digits = title.substr(badge + 4, title.size() - badge - 5);
+            if (!digits.empty() && digits.find_first_not_of(L"0123456789") == digits.npos)
+                title.resize(badge);
+        }
+        if (title.empty() || title == L"Telegram" || title.starts_with(L"Telegram (")) return {};
+    }
+    else if (process == L"ms-teams")
+    {
+        // Only the observed chat title format; meetings/search are not chats.
+        const std::wstring prefix = L"Chat | ", suffix = L" | Microsoft Teams";
+        if (!title.starts_with(prefix) || !title.ends_with(suffix) ||
+            title.size() <= prefix.size() + suffix.size()) return {};
+        title = title.substr(prefix.size(), title.size() - prefix.size() - suffix.size());
+        if (title.empty()) return {};
+    }
+    else return {};
+    return process + L"\n" + title;
+}
+inline std::wstring windowChatKey(HWND window)
+{
+    if (window && lower(processName(window)) == L"chrome") return cachedChromeChat(window);
+    return window ? chatKey(processName(window), chatTitle(window)) : L"";
+}
+inline std::vector<std::wstring> chatCycle(const Settings &settings, const std::wstring &key,
+                                         const std::vector<Layout> &layouts)
+{
+    auto found = settings.chatCycles.find(key);
+    if (key.empty() || found == settings.chatCycles.end()) return settings.cycle;
+    std::vector<std::wstring> result;
+    for (const auto &id : found->second)
+        if (std::any_of(layouts.begin(), layouts.end(), [&](const Layout &l) { return l.id == id; }))
+            result.push_back(id);
+    return result.empty() ? settings.cycle : result;
+}
+inline HKL nextChatLayout(const std::vector<std::wstring> &cycle, const std::vector<Layout> &layouts,
+                          HKL current, bool reverse)
+{
+    std::vector<HKL> handles;
+    for (const auto &id : cycle)
+        for (const auto &layout : layouts)
+            if (layout.id == id) handles.push_back(layout.handle);
+    if (handles.empty()) return nullptr;
+    auto found = std::find(handles.begin(), handles.end(), current);
+    if (found == handles.end()) return handles.front();
+    auto next = (size_t(found - handles.begin()) + (reverse ? handles.size() - 1 : 1)) % handles.size();
+    return handles[next];
+}
+}

src/core.cpp

@@ -6,6 +6,21 @@
 
 namespace ks
 {
+std::wstring snippetAppName(std::wstring name)
+{
+    auto first = name.find_first_not_of(L" \t"), last = name.find_last_not_of(L" \t");
+    if (first == name.npos) return {};
+    name = lower(name.substr(first, last - first + 1));
+    if (name.ends_with(L".exe")) name.resize(name.size() - 4);
+    return name;
+}
+int snippetAppPriority(const Snippet &snippet, const std::wstring &process)
+{
+    if (snippet.apps.empty()) return 1;
+    auto name = snippetAppName(process);
+    for (const auto &app : snippet.apps) if (snippetAppName(app) == name && !name.empty()) return 2;
+    return 0;
+}
 int HotkeyHook::update(UINT key, bool down, UINT modifiers,
                        const std::vector<std::pair<int, Hotkey>> &bindings)
 {

src/core.h

@@ -32,7 +32,10 @@ struct Snippet
 {
     std::wstring trigger, text;
     std::wstring id;
+    std::vector<std::wstring> apps; // Empty means everywhere; executable names without .exe.
 };
+std::wstring snippetAppName(std::wstring);
+int snippetAppPriority(const Snippet &, const std::wstring &process);
 std::wstring snippetId(const Snippet &);
 std::wstring newSnippetId();
 struct Template
@@ -76,6 +79,8 @@ struct Settings
                  translit = L"Ctrl+Alt+Shift+T", undo = L"Ctrl+Alt+Shift+Z", clipboard = L"Win+V",
                  screenshot = L"Win+Shift+S";
     std::vector<std::wstring> cycle, direct, directIds;
+    // Exact application + visible chat name; an absent entry uses the global cycle.
+    std::map<std::wstring, std::vector<std::wstring>> chatCycles;
     std::vector<std::wstring> excluded{L"KeePass", L"KeePassXC", L"1Password", L"Bitwarden"};
     std::vector<Snippet> snippets;
     std::vector<std::wstring> snippetTombstones;

src/platform.cpp

@@ -733,3 +733,5 @@ void log(const std::wstring &message)
     }
 }
 } // namespace ks
+
+#include "browser_chat.inc"

src/screenshot.cpp

@@ -54,7 +54,7 @@ bool confirmScreenshotClose(HWND owner)
     // If Windows cannot display the confirmation, keep the screenshot open.
     return SUCCEEDED(result) && button==IDYES;
 }
-constexpr int ToolIds[]{27,10,11,22,23,24,25,36,37,21,19,26,20,12,18,13};
+constexpr int ToolIds[]{27,10,11,22,23,24,25,36,37,38,21,19,26,20,12,18,13};
 struct Surface
 {
     HDC dc = CreateCompatibleDC(nullptr);
@@ -124,7 +124,7 @@ bool chooseTextFont(HWND owner,Mark &m)
     m.fontWeight=font.lfWeight; m.fontItalic=font.lfItalic!=0;
     return true;
 }
-constexpr int CursorTools[]{10,11,22,23,24,25,36,37,19};
+constexpr int CursorTools[]{10,11,22,23,24,25,36,37,38,19};
 HCURSOR makeToolCursor(int tool,int size)
 {
     // Monochrome AND/XOR cursor: white outline keeps the glyph visible on dark images.
@@ -148,6 +148,7 @@ HCURSOR makeToolCursor(int tool,int size)
         case 22: line(18,29,29,18); break;
         case 23: Rectangle(dc,x(17),y(18),x(30),y(29)); break;
         case 24: Ellipse(dc,x(17),y(17),x(30),y(30)); break;
+        case 38: Arc(dc,x(16),y(18),x(31),y(38),x(31),y(28),x(16),y(28)); break;
         case 25: Ellipse(dc,x(16),y(20),x(31),y(28)); break;
         case 36: { POINT p[]{{x(23),y(17)},{x(31),y(30)},{x(16),y(30)},{x(23),y(17)}}; Polyline(dc,p,4); break; }
         case 37: { POINT p[]{{x(20),y(18)},{x(27),y(18)},{x(31),y(30)},{x(16),y(30)},{x(20),y(18)}}; Polyline(dc,p,5); break; }
@@ -268,6 +269,7 @@ void updateStatus(Capture &c)
     else if(c.textTool) text=L"Text (T): click the image to type | Double-click existing text to edit";
     else if(c.highlight) text=L"Highlight (H): drag to paint | Ctrl+drag = paint over an object | V = pointer";
     else if(c.freehand) text=L"Freehand (F): auto-smooth / shapes; Ctrl+Z restores original | Shift = 45-degree steps | Ctrl = draw over objects";
+    else if(c.shape==ScreenshotShape::Arc) text=L"Arc (U): drag to draw a half ellipse | Handles = resize / rotate | V = pointer";
     else if(c.arrow) text=L"Drag to draw | Ctrl+drag over objects = linked connector | V = pointer";
     else text=L"Number (N): click to add | V = select and edit | Ctrl+C = copy screenshot";
     text=L"Zoom: "+std::to_wstring(int(std::lround(100.0*(c.view.right-c.view.left)/c.image->width)))+
@@ -409,6 +411,14 @@ std::vector<POINT> shapeOutline(const Mark &m)
         auto r=region(m.from,m.to);
         if(m.shape==ScreenshotShape::Rectangle)
             points={{r.left,r.top},{r.right,r.top},{r.right,r.bottom},{r.left,r.bottom},{r.left,r.top}};
+        else if(m.shape==ScreenshotShape::Arc) {
+            // An open half ellipse spanning the drag rectangle, with no closing chord.
+            for(int i=0;i<=90;++i) {
+                double a=i*3.141592653589793/90;
+                points.push_back({LONG(std::lround((r.left+r.right)/2.0-(r.right-r.left)/2.0*std::cos(a))),
+                                  LONG(std::lround(r.bottom-(r.bottom-r.top)*std::sin(a)))});
+            }
+        }
         else if(m.shape==ScreenshotShape::Triangle)
             points={{(r.left+r.right)/2,r.top},{r.right,r.bottom},{r.left,r.bottom},{(r.left+r.right)/2,r.top}};
         else if(m.shape==ScreenshotShape::Trapezoid)
@@ -550,7 +560,7 @@ void drawMarks(HDC dc, const std::vector<Mark> &marks, const Mark *preview = nul
             if(m.shape!=ScreenshotShape::None) {
                 auto hollow=SelectObject(dc,GetStockObject(HOLLOW_BRUSH));
                 auto r=region(m.from,m.to);
-                if(!m.points.empty() || m.rotation!=0 || m.shape==ScreenshotShape::Triangle || m.shape==ScreenshotShape::Trapezoid) {
+                if(!m.points.empty() || m.rotation!=0 || m.shape==ScreenshotShape::Triangle || m.shape==ScreenshotShape::Trapezoid || m.shape==ScreenshotShape::Arc) {
                     auto points=shapeOutline(m); Polyline(dc,points.data(),int(points.size()));
                 }
                 else if(m.shape==ScreenshotShape::Rectangle) Rectangle(dc,r.left,r.top,r.right+1,r.bottom+1);
@@ -668,7 +678,7 @@ void layout(HWND w, Capture &c)
     RECT statusRect{}; GetWindowRect(status,&statusRect);
     c.statusHeight=statusRect.bottom-statusRect.top;
     r.bottom-=c.statusHeight;
-    const int positions[]{8,44,80,116,152,188,224,260,296,332,368,404,440,488,524,572};
+    const int positions[]{8,44,80,116,152,188,224,260,296,332,368,404,440,476,524,560,608};
     static_assert(std::size(positions)==std::size(ToolIds));
     for (size_t i = 0; i < std::size(ToolIds); ++i)
     {
@@ -677,7 +687,7 @@ void layout(HWND w, Capture &c)
                    MulDiv(32,dpi,96),MulDiv(32,dpi,96),TRUE);
     }
     SendDlgItemMessageW(w,28,WM_SETFONT,(WPARAM)c.font,TRUE);
-    MoveWindow(GetDlgItem(w,28),MulDiv(612,dpi,96),MulDiv(6,dpi,96),
+    MoveWindow(GetDlgItem(w,28),MulDiv(648,dpi,96),MulDiv(6,dpi,96),
                MulDiv(78,dpi,96),MulDiv(32,dpi,96),TRUE);
     c.panelHeight=c.unit+MulDiv(40,dpi,96);
     for(int id:{30,31,32,33,34,35}) SendDlgItemMessageW(w,id,WM_SETFONT,(WPARAM)c.font,TRUE);
@@ -771,7 +781,7 @@ HCURSOR toolCursor(const Capture &c)
     if(c.pointer) return LoadCursorW(nullptr,IDC_ARROW);
     if(c.textTool) return LoadCursorW(nullptr,IDC_IBEAM);
     if(c.freehand && c.pencilCursor) return c.pencilCursor;
-    int tool=c.highlight?19:c.straight?22:c.shape==ScreenshotShape::Trapezoid?37:c.shape==ScreenshotShape::Triangle?36:c.shape!=ScreenshotShape::None?22+int(c.shape):c.arrow?11:10;
+    int tool=c.highlight?19:c.straight?22:c.shape==ScreenshotShape::Arc?38:c.shape==ScreenshotShape::Trapezoid?37:c.shape==ScreenshotShape::Triangle?36:c.shape!=ScreenshotShape::None?22+int(c.shape):c.arrow?11:10;
     for(size_t i=0;i<std::size(CursorTools);++i)
         if(CursorTools[i]==tool && c.drawingCursors[i]) return c.drawingCursors[i];
     return LoadCursorW(nullptr,IDC_CROSS);
@@ -883,7 +893,7 @@ void drawTool(const DRAWITEMSTRUCT &item, const Capture &c)
     bool active=(item.CtlID==27 && c.pointer)||(item.CtlID==10 && !c.pointer && !c.arrow && !c.highlight && !c.freehand && !c.textTool)||(item.CtlID==11 && c.arrow && !c.straight && c.shape==ScreenshotShape::None)||
                 (item.CtlID==19 && c.highlight)||(item.CtlID==21 && c.freehand)||
                 (item.CtlID==22 && c.straight)||(item.CtlID>=23 && item.CtlID<=25 && int(c.shape)==int(item.CtlID)-22)||(item.CtlID==26 && c.textTool)||
-                (item.CtlID==36 && c.shape==ScreenshotShape::Triangle)||(item.CtlID==37 && c.shape==ScreenshotShape::Trapezoid);
+                (item.CtlID==36 && c.shape==ScreenshotShape::Triangle)||(item.CtlID==37 && c.shape==ScreenshotShape::Trapezoid)||(item.CtlID==38 && c.shape==ScreenshotShape::Arc);
     bool disabled=item.itemState&ODS_DISABLED;
     POINT mouse; GetCursorPos(&mouse); ScreenToClient(item.hwndItem,&mouse);
     bool hover=PtInRect(&r,mouse) && !disabled;
@@ -897,13 +907,14 @@ void drawTool(const DRAWITEMSTRUCT &item, const Capture &c)
     RoundRect(dc,r.left,r.top,r.right,r.bottom,corner,corner);
     SelectObject(dc,oldPen); SelectObject(dc,oldBrush); DeleteObject(pen); DeleteObject(brush);
     int iconIndex=item.CtlID==35?13:item.CtlID==34?14:item.CtlID>=22?int(item.CtlID)-13:item.CtlID==18?5:item.CtlID==19?6:item.CtlID==20?7:item.CtlID==21?8:item.CtlID-10;
-    auto icon=(item.CtlID==36 || item.CtlID==37)?nullptr:item.CtlID==27?(HICON)LoadCursorW(nullptr,IDC_ARROW):c.toolIcons[disabled?2:active?1:0][iconIndex];
+    auto icon=(item.CtlID==36 || item.CtlID==37 || item.CtlID==38)?nullptr:item.CtlID==27?(HICON)LoadCursorW(nullptr,IDC_ARROW):c.toolIcons[disabled?2:active?1:0][iconIndex];
-    if(item.CtlID==36 || item.CtlID==37) {
+    if(item.CtlID==36 || item.CtlID==37 || item.CtlID==38) {
         int cx=(r.left+r.right)/2,cy=(r.top+r.bottom)/2,s=c.iconSize/2;
         auto trianglePen=CreatePen(PS_SOLID,std::max(1,MulDiv(2,GetDpiForWindow(item.hwndItem),96)),
                                   disabled?RGB(148,163,184):active?RGB(37,99,235):RGB(51,65,85));
         auto previous=SelectObject(dc,trianglePen);
-        if(item.CtlID==36) { POINT vertices[]{{cx,cy-s},{cx+s,cy+s},{cx-s,cy+s},{cx,cy-s}}; Polyline(dc,vertices,4); }
+        if(item.CtlID==38) Arc(dc,cx-s,cy-s,cx+s,cy+3*s,cx+s,cy+s,cx-s,cy+s);
+        else if(item.CtlID==36) { POINT vertices[]{{cx,cy-s},{cx+s,cy+s},{cx-s,cy+s},{cx,cy-s}}; Polyline(dc,vertices,4); }
         else { POINT vertices[]{{cx-s/2,cy-s},{cx+s/2,cy-s},{cx+s,cy+s},{cx-s,cy+s},{cx-s/2,cy-s}}; Polyline(dc,vertices,5); }
         SelectObject(dc,previous); DeleteObject(trianglePen);
     }
@@ -1025,7 +1036,7 @@ void edit(HWND w, Capture &c)
     InitCommonControlsEx(&statusControls);
     CreateWindowExW(0,STATUSCLASSNAMEW,L"",WS_CHILD|WS_VISIBLE|SBARS_TOOLTIPS,
         0,0,0,0,w,(HMENU)50,c.app.instance,nullptr);
-    const wchar_t *labels[]{L"Pointer (V): select and edit objects", L"Number (N)", L"Arrow (A); Ctrl+drag between objects to link", L"Straight line (L); Ctrl+drag between objects to link", L"Rectangle (R)", L"Circle (O)", L"Ellipse (E)", L"Triangle (G): drag to draw; drag each vertex to reshape", L"Trapezoid (B): drag to draw", L"Freehand line (F); Shift for 45-degree steps; move >50 px off line to turn; Ctrl to draw over objects", L"Highlight (H); Ctrl+drag to paint over an object",
+    const wchar_t *labels[]{L"Pointer (V): select and edit objects", L"Number (N)", L"Arrow (A); Ctrl+drag between objects to link", L"Straight line (L); Ctrl+drag between objects to link", L"Rectangle (R)", L"Circle (O)", L"Ellipse (E)", L"Triangle (G): drag to draw; drag each vertex to reshape", L"Trapezoid (B): drag to draw", L"Arc (U): drag to draw a half ellipse; use handles to resize or rotate", L"Freehand line (F); Shift for 45-degree steps; move >50 px off line to turn; Ctrl to draw over objects", L"Highlight (H); Ctrl+drag to paint over an object",
         L"Text (T); double-click or F2 to edit", L"Color — selected object and new objects", L"Undo (Ctrl+Z)", L"Redo (Ctrl+Y / Ctrl+Shift+Z)", L"Copy (Ctrl+C)"};
     static_assert(std::size(labels)==std::size(ToolIds));
     auto saveButton=CreateWindowW(L"BUTTON",L"Save...",WS_CHILD|WS_VISIBLE|WS_TABSTOP|BS_PUSHBUTTON,
@@ -1120,7 +1131,7 @@ LRESULT CALLBACK captureProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             }
             break;
         case WM_DRAWITEM:
-            if((wp>=10 && wp<=13) || (wp>=18 && wp<=27) || wp==34 || wp==35 || wp==36 || wp==37) { drawTool(*reinterpret_cast<DRAWITEMSTRUCT *>(lp),*c); return TRUE; }
+            if((wp>=10 && wp<=13) || (wp>=18 && wp<=27) || wp==34 || wp==35 || wp==36 || wp==37 || wp==38) { drawTool(*reinterpret_cast<DRAWITEMSTRUCT *>(lp),*c); return TRUE; }
             break;
         case WM_CTLCOLORSTATIC:
             SetBkColor((HDC)wp,RGB(255,255,255)); SetTextColor((HDC)wp,RGB(51,65,85));
@@ -1214,13 +1225,13 @@ LRESULT CALLBACK captureProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                 if(changed) { c->copied=false; c->selected=-1; c->selectedLabel=false; c->wheelDelta=0; c->wheelTarget=-1; }
                 c->syncHistory();
             }
-            if (LOWORD(wp)==10 || LOWORD(wp)==11 || LOWORD(wp)==19 || LOWORD(wp)==36 || LOWORD(wp)==37 || (LOWORD(wp)>=21 && LOWORD(wp)<=27))
+            if (LOWORD(wp)==10 || LOWORD(wp)==11 || LOWORD(wp)==19 || LOWORD(wp)==36 || LOWORD(wp)==37 || LOWORD(wp)==38 || (LOWORD(wp)>=21 && LOWORD(wp)<=27))
             {
                 c->pointer=LOWORD(wp)==27;
-                c->arrow = LOWORD(wp)==11 || LOWORD(wp)==36 || LOWORD(wp)==37 || (LOWORD(wp)>=22 && LOWORD(wp)<=25);
+                c->arrow = LOWORD(wp)==11 || LOWORD(wp)==36 || LOWORD(wp)==37 || LOWORD(wp)==38 || (LOWORD(wp)>=22 && LOWORD(wp)<=25);
                 c->straight=LOWORD(wp)==22;
                 c->textTool=LOWORD(wp)==26;
-                c->shape=LOWORD(wp)==37?ScreenshotShape::Trapezoid:LOWORD(wp)==36?ScreenshotShape::Triangle:LOWORD(wp)>=23 && LOWORD(wp)<=25?ScreenshotShape(LOWORD(wp)-22):ScreenshotShape::None;
+                c->shape=LOWORD(wp)==38?ScreenshotShape::Arc:LOWORD(wp)==37?ScreenshotShape::Trapezoid:LOWORD(wp)==36?ScreenshotShape::Triangle:LOWORD(wp)>=23 && LOWORD(wp)<=25?ScreenshotShape(LOWORD(wp)-22):ScreenshotShape::None;
                 c->selected=-1; c->selectedLabel=false;
                 c->highlight=LOWORD(wp)==19;
                 c->freehand=LOWORD(wp)==21;
@@ -1233,6 +1244,7 @@ LRESULT CALLBACK captureProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                 for(int id=22;id<=27;++id) InvalidateRect(GetDlgItem(w,id),nullptr,FALSE);
                 InvalidateRect(GetDlgItem(w,36),nullptr,FALSE);
                 InvalidateRect(GetDlgItem(w,37),nullptr,FALSE);
+                InvalidateRect(GetDlgItem(w,38),nullptr,FALSE);
             }
 
             SetFocus(w); captureCursor(w,*c); InvalidateRect(w,nullptr,FALSE); return 0;
@@ -1293,6 +1305,7 @@ LRESULT CALLBACK captureProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                     if(wp=='E') SendMessageW(w,WM_COMMAND,25,0);
                     if(wp=='G') SendMessageW(w,WM_COMMAND,36,0);
                     if(wp=='B') SendMessageW(w,WM_COMMAND,37,0);
+                    if(wp=='U') SendMessageW(w,WM_COMMAND,38,0);
                 }
                 if (wp=='N' || wp=='A') SendMessageW(w,WM_COMMAND,wp=='N'?10:11,0);
                 if(wp=='H') SendMessageW(w,WM_COMMAND,19,0);
@@ -1563,7 +1576,7 @@ LRESULT CALLBACK captureProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                         c->marks.back().style=c->lineStyle; c->marks.back().ends=c->straight || c->shape!=ScreenshotShape::None?LineEnds::None:c->arrowEnds;
                         c->marks.back().shape=c->shape;
                         auto &mark=c->marks.back();
-                        if(mark.shape==ScreenshotShape::Triangle || mark.shape==ScreenshotShape::Trapezoid) mark.points=shapeOutline(mark);
+                        if(mark.shape==ScreenshotShape::Triangle || mark.shape==ScreenshotShape::Trapezoid || mark.shape==ScreenshotShape::Arc) mark.points=shapeOutline(mark);
                         linkScreenshotEndpoint(mark,true,c->start,c->marks,6);
                         linkScreenshotEndpoint(mark,false,c->end,c->marks,6);
                         resolveScreenshotLinks(c->marks);
@@ -1586,7 +1599,7 @@ LRESULT CALLBACK captureProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             if (c->editing)
             {
                 auto limits = reinterpret_cast<MINMAXINFO *>(lp);
-                limits->ptMinTrackSize = {MulDiv(730,GetDpiForWindow(w),96),MulDiv(240,GetDpiForWindow(w),96)};
+                limits->ptMinTrackSize = {MulDiv(766,GetDpiForWindow(w),96),MulDiv(240,GetDpiForWindow(w),96)};
                 return 0;
             }
             break;

src/screenshot.h

@@ -15,7 +15,7 @@ void showScreenshot(ScreenshotHost &);
 void showScreenshotEditor(ScreenshotHost &,const Clip &);
 enum class LineStyle { Solid, Dotted, Dashed, DashDot };
 enum class LineEnds { End, Start, Both, None };
-enum class ScreenshotShape { None, Rectangle, Circle, Ellipse, Triangle, Trapezoid };
+enum class ScreenshotShape { None, Rectangle, Circle, Ellipse, Triangle, Trapezoid, Arc };
 struct ScreenshotOffset { double x, y; };
 struct ScreenshotLink {
     unsigned long long target{};

src/storage.cpp

@@ -61,6 +61,25 @@ bool validId(const std::wstring &id)
 } // namespace
 void validateSettings(const Settings &s)
 {
+    if (s.chatCycles.size() > 1000) throw std::runtime_error("Too many chat language profiles");
+    for (const auto &[key, cycle] : s.chatCycles)
+    {
+        auto separator = key.find(L'\n');
+        if (separator == key.npos || separator + 1 == key.size() || key.size() > 1024 ||
+            key.find(L'\n', separator + 1) != key.npos || key.find(L'\r') != key.npos ||
+            (key.substr(0, separator) != L"telegram" && key.substr(0, separator) != L"ms-teams" && key.substr(0, separator) != L"viber" && key.substr(0, separator) != L"telegram-web"))
+            throw std::runtime_error("Invalid chat language profile");
+        if (cycle.empty() || cycle.size() > 64) throw std::runtime_error("Select at least one chat language");
+        std::vector<std::wstring> seen;
+        for (const auto &id : cycle)
+        {
+            if (id.size() != 12 || !id.starts_with(L"win:") ||
+                id.find_first_not_of(L"0123456789abcdefABCDEF", 4) != id.npos ||
+                std::find(seen.begin(), seen.end(), id) != seen.end())
+                throw std::runtime_error("Invalid or duplicate chat layout");
+            seen.push_back(id);
+        }
+    }
     if (s.tesseractPath.size() > 32700 || s.tesseractPath.find_first_of(L"\r\n\"") != s.tesseractPath.npos)
         throw std::runtime_error("Invalid Tesseract executable path");
     if (s.tesseractLanguages.empty() || s.tesseractLanguages.size() > 128 ||
@@ -118,9 +137,11 @@ void validateSettings(const Settings &s)
                               L"абвгдеёжзийклмнопрстуфхцчшщъыьэюя"})
             valid |= !from.empty() && !to.empty() && from.size() <= 32 && to.size() <= 32 &&
                      from == lower(from) && to == lower(to) && from != to &&
-                     from.find_first_not_of(alphabet) == from.npos && to.find_first_not_of(alphabet) == to.npos;
+                     from.find_first_not_of(alphabet) == from.npos &&
+                     to.find_first_not_of(std::wstring(alphabet) + L" ") == to.npos &&
+                     to.front() != L' ' && to.back() != L' ' && to.find(L"  ") == to.npos;
         if (!valid)
-            throw std::runtime_error("Replacement pairs must be different lowercase words of 1-32 letters in the same language");
+            throw std::runtime_error("Use a lowercase typo of 1-32 letters and a different correction of 1-32 characters in the same language. Single spaces between correction words are allowed.");
     }
     for (const auto &[language, words] : s.autoWords)
     {
@@ -148,8 +169,19 @@ void validateSettings(const Settings &s)
         if (snippet.trigger.size() < 2 || snippet.trigger.size() > 64 ||
             snippet.trigger.find_first_of(L"\r\n\t ") != snippet.trigger.npos)
             throw std::runtime_error("Snippet triggers must contain 2–64 characters without whitespace");
-        if (!seen.insert(lower(snippet.trigger)).second)
+        if (snippet.apps.size() > 64) throw std::runtime_error("Too many snippet applications");
-            throw std::runtime_error("Duplicate snippet trigger");
+        std::vector<std::wstring> scopes;
+        for (const auto &app : snippet.apps)
+        {
+            auto normalized = snippetAppName(app);
+            if (normalized.empty() || normalized.size() > 250 || normalized.find_first_of(L"\\/:*?\"<>|,\r\n\t") != normalized.npos)
+                throw std::runtime_error("Use application names such as chrome.exe, not paths or wildcards");
+            scopes.push_back(normalized);
+        }
+        if (scopes.empty()) scopes.push_back(L"");
+        for (const auto &scope : scopes)
+            if (!seen.insert(lower(snippet.trigger) + L"\n" + scope).second)
+                throw std::runtime_error("Duplicate snippet trigger for the same application or global scope");
         auto t = parseTemplate(snippet.text);
         if (t.text.empty() || t.cursors > 1)
             throw std::runtime_error("Each snippet needs text and at most one {cursor} marker");
@@ -232,6 +264,16 @@ Settings decodeSettings(const Bytes &bytes, const std::vector<Layout> &layouts)
                 s.cycle.push_back(w);
         }
     }
+    if (j.contains("chatCycles"))
+    {
+        if (!j.at("chatCycles").is_object()) throw std::runtime_error("Invalid chat profiles object");
+        for (const auto &[key, cycle] : j.at("chatCycles").items())
+        {
+            if (!cycle.is_array() || cycle.empty()) throw std::runtime_error("Empty chat language profile");
+            for (const auto &id : cycle)
+                s.chatCycles[wide(key)].push_back(wide(id.get<std::string>()));
+        }
+    }
     if (j.contains("layoutHotkeys"))
     {
         std::fill(s.direct.begin(), s.direct.end(), L"");
@@ -250,6 +292,12 @@ Settings decodeSettings(const Bytes &bytes, const std::vector<Layout> &layouts)
         for (auto &sn : j.at("snippets"))
         {
             Snippet item{str(sn, "trigger"), str(sn, "text"), str(sn, "id")};
+            if (sn.contains("apps"))
+            {
+                if (!sn.at("apps").is_array()) throw std::runtime_error("Snippet apps must be a list");
+                for (const auto &app : sn.at("apps")) item.apps.push_back(snippetAppName(wide(app.get<std::string>())));
+            }
+            if (item.id.empty() && !item.apps.empty()) item.id = newSnippetId();
             item.id = snippetId(item);
             s.snippets.push_back(std::move(item));
         }
@@ -288,6 +336,9 @@ Bytes encodeSettings(const Settings &s)
               {"screenshotHotkey", utf8(s.screenshot)},
               {"screenshotAutoOpenEditor", s.screenshotAutoOpenEditor}};
     j["layouts"] = Json::array();
+    j["chatCycles"] = Json::object();
+    for (const auto &[key, cycle] : s.chatCycles)
+        for (const auto &id : cycle) j["chatCycles"][utf8(key)].push_back(utf8(id));
     for (auto &id : s.cycle)
         j["layouts"].push_back(utf8(id));
     j["autoCorrectLayout"] = s.autoCorrect;
@@ -320,7 +371,15 @@ Bytes encodeSettings(const Settings &s)
         j["layoutHotkeys"].push_back({{"layoutId", utf8(s.directIds[i])}, {"hotkey", utf8(s.direct[i])}});
     j["snippets"] = Json::array();
     for (auto &sn : s.snippets)
-        j["snippets"].push_back({{"trigger", utf8(sn.trigger)}, {"text", utf8(sn.text)}, {"id", utf8(snippetId(sn))}});
+    {
+        Json item{{"trigger", utf8(sn.trigger)}, {"text", utf8(sn.text)}, {"id", utf8(snippetId(sn))}};
+        if (!sn.apps.empty())
+        {
+            item["apps"] = Json::array();
+            for (const auto &app : sn.apps) item["apps"].push_back(utf8(snippetAppName(app)));
+        }
+        j["snippets"].push_back(std::move(item));
+    }
     j["snippetTombstones"] = Json::array();
     for (const auto &id : s.snippetTombstones) j["snippetTombstones"].push_back(utf8(id));
     j["excludedApps"] = Json::array();
@@ -344,6 +403,20 @@ Bytes encodeClip(const Clip &clip)
     }
     return b;
 }
+Bytes selectionClipboardIdentity(const Clip &clip)
+{
+    auto normalized = clip;
+    // GlobalSize includes allocation slack. A clipboard relay may allocate a
+    // different-sized block for the same NUL-terminated Unicode string.
+    for (auto &format : normalized.formats)
+        if (format.id == CF_UNICODETEXT)
+            format = textClip(clip.text()).formats.front();
+    std::sort(normalized.formats.begin(), normalized.formats.end(), [](const Format &a, const Format &b)
+    {
+        return std::tie(a.name, a.id) < std::tie(b.name, b.id);
+    });
+    return encodeClip(normalized);
+}
 Clip decodeClip(const Bytes &b)
 {
     size_t p = 0;

src/storage.h

@@ -46,6 +46,7 @@ class History
     std::vector<Entry> search(const std::wstring &, bool pinnedOnly = false) const;
 };
 Bytes encodeClip(const Clip &);
+Bytes selectionClipboardIdentity(const Clip &);
 Clip decodeClip(const Bytes &);
 bool sameClipboardImage(const Clip &, const Clip &);
 int runImageHistoryCapture(const std::filesystem::path &request);

src/sync.cpp

@@ -219,7 +219,8 @@ Bytes sharedSyncSettings(const Settings &s)
         return a.at("layoutId").get<std::string>() < b.at("layoutId").get<std::string>();
     });
     for (auto key : {"startWithSystem", "autostartAsAdministrator", "tesseractPath", "useTesseract",
-        "historyEnabled", "maxItems", "maxTotalMegabytes", "maxImageMegabytes", "writeLog", "preventScreenLock"}) j.erase(key);
+        "historyEnabled", "maxItems", "maxTotalMegabytes", "maxImageMegabytes", "writeLog", "preventScreenLock",
+        "chatCycles"}) j.erase(key); // Chat names and matching rules stay on this PC.
     return bytes(canonicalProfile(j));
 }
 Settings restoreSyncSettings(const Bytes &shared, const Settings &local, const std::vector<Layout> &layouts, bool keepLocalLayouts)

src/sync_merge.inl

@@ -158,8 +158,14 @@ void collisionPaths(const Json &j, std::set<std::string> &paths)
         if (sn.is_null() || tombstone(sn)) continue;
         auto path = "/snippets/" + pointerKey(id);
         auto key = lower(wide(sn.at("trigger").get<std::string>()));
-        auto [it, inserted] = triggers.emplace(key, path);
+        std::vector<std::wstring> scopes;
-        if (!inserted) { paths.insert(path); paths.insert(it->second); }
+        if (sn.contains("apps")) for (const auto &app : sn.at("apps")) scopes.push_back(snippetAppName(wide(app.get<std::string>())));
+        if (scopes.empty()) scopes.push_back(L"");
+        for (const auto &scope : scopes)
+        {
+            auto [it, inserted] = triggers.emplace(key + L"\n" + scope, path);
+            if (!inserted) { paths.insert(path); paths.insert(it->second); }
+        }
     }
     std::map<std::pair<UINT, UINT>, std::string> shortcuts;
     auto add = [&](const Json &text, const std::string &path) {

src/ui.cpp

@@ -493,6 +493,7 @@ struct HistoryView
     std::set<std::wstring> pending;
     bool scrolling{};
     bool closed{};
+    bool selectFirstOnResults{};
 };
 bool selectedImage(HWND w, HistoryView *v)
 {
@@ -514,7 +515,7 @@ void search(HWND w, HistoryView *v)
     v->previewActive = std::make_shared<std::atomic<bool>>(true);
     v->closed = false;
     auto q = value(w, 101);
-    const bool pinnedOnly = SendDlgItemMessageW(w, 117, CB_GETCURSEL, 0, 0) == 1;
+    const bool pinnedOnly = SendDlgItemMessageW(w, 117, BM_GETCHECK, 0, 0) == BST_CHECKED;
     auto generation = ++v->generation;
     v->pending.clear();
     auto *app = v->app;
@@ -740,7 +741,7 @@ LRESULT CALLBACK historyProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
         case WM_COMMAND:
         {
             int id = LOWORD(wp);
-            if (id == 117 && HIWORD(wp) == CBN_SELCHANGE)
+            if (id == 117 && HIWORD(wp) == BN_CLICKED)
             {
                 KillTimer(w, 1);
                 search(w, v);
@@ -816,6 +817,14 @@ LRESULT CALLBACK historyProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             int top=(int)SendDlgItemMessageW(w,102,LB_GETTOPINDEX,0,0);
             auto topId=top>=0 && top<(int)v->items.size()?v->items[top].id:L"";
             if (topId.empty()) topId = v->rememberedTop;
+            if (v->selectFirstOnResults)
+            {
+                old.clear();
+                topId.clear();
+                v->rememberedSelection.clear();
+                v->rememberedTop.clear();
+                v->selectFirstOnResults = false;
+            }
             v->items = std::move(result->items);
             SendDlgItemMessageW(w, 102, WM_SETREDRAW, FALSE, 0);
             SendDlgItemMessageW(w, 102, LB_RESETCONTENT, 0, 0);
@@ -918,7 +927,7 @@ LRESULT CALLBACK historyProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             int top = (int)SendDlgItemMessageW(w,102,LB_GETTOPINDEX,0,0);
             v->rememberedTop = top >= 0 && top < (int)v->items.size() ? v->items[top].id : L"";
             v->app->saveHistoryView(v->rememberedSelection, v->rememberedTop, value(w, 101),
-                                   SendDlgItemMessageW(w, 117, CB_GETCURSEL, 0, 0) == 1);
+                                   SendDlgItemMessageW(w, 117, BM_GETCHECK, 0, 0) == BST_CHECKED);
             KillTimer(w, 1);
             v->closed = true;
             v->previewActive->store(false);
@@ -958,7 +967,129 @@ struct SettingsView
     std::vector<int> order;
     int selection = -1;
     bool filling{};
+    std::vector<std::vector<HWND>> pages;
 };
+void selectSettingsPage(HWND w, SettingsView *v)
+{
+    int selected = TabCtrl_GetCurSel(GetDlgItem(w, 260));
+    for (size_t page = 0; page < v->pages.size(); ++page)
+        for (HWND child : v->pages[page]) ShowWindow(child, (int)page == selected ? SW_SHOWNA : SW_HIDE);
+    InvalidateRect(w, nullptr, TRUE);
+}
+struct ChatLanguagesView
+{
+    HWND parent{};
+    SettingsView *settings{};
+    std::vector<std::wstring> keys;
+};
+void fillChatLanguages(HWND w, ChatLanguagesView *v)
+{
+    int index = (int)SendDlgItemMessageW(w, 710, LB_GETCURSEL, 0, 0);
+    if (index < 0 || index >= (int)v->keys.size()) return;
+    const auto &draft = v->settings->draft;
+    auto saved = draft.chatCycles.find(v->keys[index]);
+    const auto &cycle = saved == draft.chatCycles.end() ? draft.cycle : saved->second;
+    for (size_t i = 0; i < v->settings->order.size(); ++i)
+    {
+        auto &layout = v->settings->app->layouts[v->settings->order[i]];
+        SendDlgItemMessageW(w, 711, LB_SETSEL,
+            std::find(cycle.begin(), cycle.end(), layout.id) != cycle.end(), i);
+    }
+    value(w, 712, saved == draft.chatCycles.end() ? L"No profile yet. Select the languages for this chat." :
+        L"Saved profile. Select languages, or remove it to use the defaults.");
+    EnableWindow(GetDlgItem(w, 713), saved != draft.chatCycles.end());
+}
+LRESULT CALLBACK chatLanguagesProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
+{
+    auto *v = (ChatLanguagesView *)GetWindowLongPtrW(w, GWLP_USERDATA);
+    if (!v) return DefWindowProcW(w, msg, wp, lp);
+    try
+    {
+        if (msg == WM_COMMAND)
+        {
+            int id = LOWORD(wp);
+            if (id == 710 && HIWORD(wp) == LBN_SELCHANGE) { fillChatLanguages(w, v); return 0; }
+            if (id == IDOK || id == 713)
+            {
+                int selected = (int)SendDlgItemMessageW(w, 710, LB_GETCURSEL, 0, 0);
+                if (selected < 0 || selected >= (int)v->keys.size())
+                    throw std::runtime_error("Open Telegram, Telegram Web K in Chrome, or Teams, then reopen this dialog. Viber OCR is disabled.");
+                auto next = v->settings->draft;
+                if (id == 713) next.chatCycles.erase(v->keys[selected]);
+                else
+                {
+                    std::vector<std::wstring> cycle;
+                    for (size_t i = 0; i < v->settings->order.size(); ++i)
+                        if (SendDlgItemMessageW(w, 711, LB_GETSEL, i, 0) > 0)
+                            cycle.push_back(v->settings->app->layouts[v->settings->order[i]].id);
+                    if (cycle.empty()) throw std::runtime_error("Select at least one language.");
+                    next.chatCycles[v->keys[selected]] = std::move(cycle);
+                }
+                validateSettings(next);
+                v->settings->draft.chatCycles = std::move(next.chatCycles);
+                DestroyWindow(w);
+                return 0;
+            }
+            if (id == IDCANCEL) { DestroyWindow(w); return 0; }
+        }
+        if (msg == WM_CLOSE) { DestroyWindow(w); return 0; }
+        if (msg == WM_DPICHANGED) { resizeForDpi(w, wp, lp); return 0; }
+        if (msg == WM_NCDESTROY)
+        {
+            EnableWindow(v->parent, TRUE);
+            SetForegroundWindow(v->parent);
+            disposeFont(w);
+            delete v;
+            SetWindowLongPtrW(w, GWLP_USERDATA, 0);
+        }
+    }
+    catch (const std::exception &e) { error(w, e); }
+    return DefWindowProcW(w, msg, wp, lp);
+}
+void showChatLanguages(HWND parent, SettingsView *settings)
+{
+    std::set<std::wstring> keys;
+    for (const auto &[key, cycle] : settings->draft.chatCycles) keys.insert(key);
+    struct Context { std::set<std::wstring> &keys; const Settings &settings; } context{keys, settings->draft};
+    EnumWindows([](HWND candidate, LPARAM context) -> BOOL
+    {
+        if (!IsWindowVisible(candidate)) return TRUE;
+        auto &data = *(Context *)context;
+        auto key = lower(processName(candidate)) == L"chrome" ? readChromeChat(candidate) : windowChatKey(candidate);
+        if (!key.empty()) data.keys.insert(std::move(key));
+        return TRUE;
+    }, (LPARAM)&context);
+    HWND w = makeWindow(*settings->app, L"KSwitcher.ChatLanguages", L"Languages for a chat", chatLanguagesProc, 640, 524);
+    auto *v = new ChatLanguagesView{parent, settings, {keys.begin(), keys.end()}};
+    SetWindowLongPtrW(w, GWLP_HWNDPARENT, (LONG_PTR)parent);
+    SetWindowLongPtrW(w, GWLP_USERDATA, (LONG_PTR)v);
+    label(w, L"Telegram / Telegram Web (Chrome) / Teams; Viber inactive", 18, 16, 604);
+    control(w, L"LISTBOX", L"", WS_TABSTOP | WS_VSCROLL | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT | WS_BORDER,
+            710, 18, 44, 604, 140);
+    for (const auto &key : v->keys)
+    {
+        auto split = key.find(L'\n');
+        auto name = std::wstring(key.starts_with(L"telegram\n") ? L"Telegram: " : key.starts_with(L"telegram-web\n") ? L"Telegram Web: " : key.starts_with(L"viber\n") ? L"Viber (inactive): " : L"Teams: ") + key.substr(split + 1);
+        SendDlgItemMessageW(w, 710, LB_ADDSTRING, 0, (LPARAM)name.c_str());
+    }
+    control(w, L"STATIC", L"Open a chat, then reopen this dialog to add it.", 0, 712, 18, 194, 604, 26);
+    label(w, L"Click languages to include (saved in the order shown)", 18, 228, 604);
+    control(w, L"LISTBOX", L"", WS_TABSTOP | WS_VSCROLL | LBS_MULTIPLESEL | LBS_NOINTEGRALHEIGHT | WS_BORDER,
+            711, 18, 256, 604, 132);
+    for (int i : settings->order)
+        SendDlgItemMessageW(w, 711, LB_ADDSTRING, 0, (LPARAM)settings->app->layouts[i].name.c_str());
+    label(w, L"Applies to Alt+Shift, Win+Space and KSwitcher Next layout.", 18, 402, 604);
+    label(w, L"Matched by chat name. Identical names share a profile. Then Save settings.", 18, 430, 604);
+    button(w, L"&Remove profile", 713, 18, 476, 170);
+    button(w, L"&Use languages", IDOK, 300, 476, 170);
+    button(w, L"&Cancel", IDCANCEL, 486, 476, 136);
+    EnableWindow(GetDlgItem(w, IDOK), !keys.empty());
+    EnableWindow(GetDlgItem(w, 713), FALSE);
+    if (!keys.empty()) { SendDlgItemMessageW(w, 710, LB_SETCURSEL, 0, 0); fillChatLanguages(w, v); }
+    EnableWindow(parent, FALSE);
+    showRequestedWindow(w);
+    SetFocus(GetDlgItem(w, 710));
+}
 void collectLayout(HWND w, SettingsView *v)
 {
     if (v->selection < 0 || v->selection >= (int)v->order.size())
@@ -1276,7 +1407,7 @@ void showAutoOptions(HWND parent, SettingsView *v)
     label(w, L"Enter punctuation without spaces or separators. These characters are kept.", 18, 530, 525);
     checkbox(w, L"Use custom &replacements (take priority over dictionaries)", 414, 18, 562, 524);
     check(w, 414, v->draft.autoReplace);
-    label(w, L"One pair per line: typo=correction (same language, letters only)", 18, 592, 525);
+    label(w, L"One pair per line: typo=correction (same language; correction may contain spaces)", 18, 592, 525);
     edit(w, 416, 18, 618, 524, 70, ES_MULTILINE | WS_VSCROLL | ES_AUTOVSCROLL | ES_WANTRETURN);
     std::wstring pairs;
     for (const auto &[from, to] : v->draft.autoReplacements) pairs += from + L"=" + to + L"\r\n";
@@ -1452,6 +1583,13 @@ LRESULT CALLBACK settingsProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
     {
         switch (msg)
         {
+        case WM_NOTIFY:
+            if (((NMHDR *)lp)->idFrom == 260 && ((NMHDR *)lp)->code == TCN_SELCHANGE)
+            {
+                selectSettingsPage(w, v);
+                return 0;
+            }
+            break;
         case WM_COMMAND:
         {
             int id = LOWORD(wp);
@@ -1468,6 +1606,7 @@ LRESULT CALLBACK settingsProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             }
             if (id == 257) { showOcrOptions(w, v); return 0; }
             if (id == 258) { showSyncOptions(w, *v->app); return 0; }
+            if (id == 259) { collectLayout(w, v); showChatLanguages(w, v); return 0; }
             if (id == 230)
             {
                 collectLayout(w, v);
@@ -1573,14 +1712,27 @@ void updateSnippetEditor(HWND w, SnippetView *v)
     bool selected = v->selection >= 0 && v->selection < (int)v->snippets.size();
     value(w, 302, selected ? v->snippets[v->selection].trigger : L"");
     value(w, 303, selected ? v->snippets[v->selection].text : L"");
-    for (int id : {302, 303, 311, 312, 313})
+    std::wstring apps;
+    if (selected) for (const auto &app : v->snippets[v->selection].apps)
+    {
+        if (!apps.empty()) apps += L", ";
+        if (!app.empty()) apps += app + L".exe";
+    }
+    value(w, 315, apps);
+    bool restricted = selected && !v->snippets[v->selection].apps.empty();
+    CheckDlgButton(w, 314, restricted ? BST_CHECKED : BST_UNCHECKED);
+    for (int id : {302, 303, 311, 312, 313, 314})
         EnableWindow(GetDlgItem(w, id), selected);
+    for (int id : {315, 316, 317}) EnableWindow(GetDlgItem(w, id), selected && restricted);
 }
 void fillSnippets(HWND w, SnippetView *v)
 {
     SendDlgItemMessageW(w, 301, LB_RESETCONTENT, 0, 0);
     for (auto &sn : v->snippets)
-        SendDlgItemMessageW(w, 301, LB_ADDSTRING, 0, (LPARAM)sn.trigger.c_str());
+    {
+        auto label = sn.trigger + (sn.apps.empty() ? L" [All apps]" : L" [" + sn.apps.front() + (sn.apps.size() > 1 ? L", ...]" : L"]"));
+        SendDlgItemMessageW(w, 301, LB_ADDSTRING, 0, (LPARAM)label.c_str());
+    }
     if (v->selection >= 0)
         SendDlgItemMessageW(w, 301, LB_SETCURSEL, v->selection, 0);
     updateSnippetEditor(w, v);
@@ -1593,6 +1745,18 @@ void collectSnippet(HWND w, SnippetView *v)
         if (snippet.id.empty()) snippet.id = snippetId(snippet);
         snippet.trigger = value(w, 302);
         snippet.text = value(w, 303);
+        snippet.apps.clear();
+        if (IsDlgButtonChecked(w, 314) == BST_CHECKED)
+        {
+            std::wistringstream input(value(w, 315)); std::wstring item;
+            while (std::getline(input, item, L','))
+            {
+                auto app = snippetAppName(item);
+                if (!app.empty()) snippet.apps.push_back(app);
+            }
+            // An explicitly restricted but empty list must not become global.
+            if (snippet.apps.empty()) snippet.apps.push_back(L"");
+        }
     }
 }
 LRESULT CALLBACK snippetProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
@@ -1619,6 +1783,24 @@ LRESULT CALLBACK snippetProc(HWND w, UINT msg, WPARAM wp, LPARAM lp)
         case WM_COMMAND:
         {
             int id = LOWORD(wp);
+            if (id == 314)
+            {
+                bool restricted = IsDlgButtonChecked(w, 314) == BST_CHECKED;
+                for (int field : {315, 316, 317}) EnableWindow(GetDlgItem(w, field), restricted);
+                return 0;
+            }
+            if (id == 317)
+            {
+                auto app = value(w, 316);
+                if (!app.empty())
+                {
+                    auto current = value(w, 315);
+                    std::wistringstream input(current); std::wstring entry;
+                    while (std::getline(input, entry, L',')) if (snippetAppName(entry) == snippetAppName(app)) return 0;
+                    value(w, 315, current.empty() ? app : current + L", " + app);
+                }
+                return 0;
+            }
             if (id == 301 && HIWORD(wp) == LBN_SELCHANGE)
             {
                 collectSnippet(w, v);
@@ -1745,14 +1927,11 @@ void showHistory(App &app, bool visible)
         HWND w = makeWindow(app, L"KSwitcher.History", L"Clipboard history", historyProc, 760, 500);
         app.historyWindow = w;
         windowLayoutState(w)->history = true;
-        label(w, L"&Filter", 16, 12, 170);
+        auto filter = control(w, L"BUTTON", L"★ Pinned only", WS_TABSTOP | BS_AUTOCHECKBOX,
-        auto filter = control(w, L"COMBOBOX", L"", WS_TABSTOP | CBS_DROPDOWNLIST | WS_VSCROLL,
+                              117, 16, 38, 112, 25);
-                              117, 16, 38, 170, 100);
+        SendMessageW(filter, BM_SETCHECK, app.historyPinnedOnly ? BST_CHECKED : BST_UNCHECKED, 0);
-        SendMessageW(filter, CB_ADDSTRING, 0, (LPARAM)L"All items");
+        label(w, L"&Search clipboard history", 136, 12, 500);
-        SendMessageW(filter, CB_ADDSTRING, 0, (LPARAM)L"★ Pinned only");
+        edit(w, 101, 136, 38, 608);
-        SendMessageW(filter, CB_SETCURSEL, app.historyPinnedOnly ? 1 : 0, 0);
-        label(w, L"&Search clipboard history", 194, 12, 500);
-        edit(w, 101, 194, 38, 550);
         auto list = control(w, L"LISTBOX", L"",
                             WS_TABSTOP | WS_VSCROLL | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT | WS_BORDER |
                                 LBS_OWNERDRAWFIXED | LBS_HASSTRINGS,
@@ -1774,6 +1953,10 @@ void showHistory(App &app, bool visible)
         }
     }
     if (!visible) return;
+    // A fresh invocation starts at the newest matching item. Background search
+    // and OCR refreshes still preserve the user's selection while browsing.
+    auto *view = (HistoryView *)GetWindowLongPtrW(app.historyWindow, GWLP_USERDATA);
+    view->selectFirstOnResults = true;
     POINT cursor;
     GetCursorPos(&cursor);
     MONITORINFO monitor{sizeof(monitor)};
@@ -1805,56 +1988,94 @@ void showSettings(App &app, bool visible)
         activateWindow(target);
         return;
     }
-    HWND w = makeWindow(app, L"KSwitcher.Settings", L"KSwitcher settings", settingsProc, 780, 660, 0, false);
+    HWND w = makeWindow(app, L"KSwitcher.Settings", L"KSwitcher settings", settingsProc, 720, 510, 0, false);
     app.settingsWindow = w;
-    label(w, L"Text conversion", 18, 16);
+    auto *v = (SettingsView *)GetWindowLongPtrW(w, GWLP_USERDATA);
-    checkbox(w, L"Con&vert recently typed text when nothing is selected", 201, 18, 43, 390);
+    INITCOMMONCONTROLSEX tabsInit{sizeof(tabsInit), ICC_TAB_CLASSES};
-    checkbox(w, L"Switch Windows input &layout after conversion", 202, 18, 70, 390);
+    InitCommonControlsEx(&tabsInit);
-    checkbox(w, L"Record clip&board history", 203, 18, 106);
+    HWND tabs = control(w, WC_TABCONTROLW, L"", WS_TABSTOP, 260, 18, 16, 684, 32);
-    checkbox(w, L"Start with &Windows", 204, 18, 133);
+    const wchar_t *tabNames[] = {L"General", L"Languages", L"Shortcuts", L"Clipboard", L"Tools"};
-    checkbox(w, L"Start with Windows as ad&ministrator", 206, 18, 160, 395);
+    for (int i = 0; i < 5; ++i)
-    checkbox(w, L"&Keep screen awake", 205, 18, 184, 210);
+    {
-    checkbox(w, L"Write lo&g", 208, 240, 184, 160);
+        TCITEMW item{}; item.mask = TCIF_TEXT; item.pszText = const_cast<wchar_t *>(tabNames[i]);
-    label(w, L"Click a shortcut and press the desired keys", 420, 16, 350);
+        TabCtrl_InsertItem(tabs, i, &item);
-    const wchar_t *names[] = {L"Next layout", L"Change case", L"Transliterate", L"Undo",
+    }
-                              L"Clipboard history", L"Screen capture"};
+    size_t start = windowLayoutState(w)->controls.size();
+    auto page = [&]
+    {
+        std::vector<HWND> children;
+        const auto &controls = windowLayoutState(w)->controls;
+        for (size_t i = start; i < controls.size(); ++i) children.push_back(controls[i].first);
+        v->pages.push_back(std::move(children));
+        start = controls.size();
+    };
+    label(w, L"Text conversion", 24, 76, 650);
+    checkbox(w, L"Con&vert recently typed text when nothing is selected", 201, 24, 110, 660);
+    checkbox(w, L"Switch Windows input &layout after conversion", 202, 24, 146, 660);
+    checkbox(w, L"Automatic correction (e&xperimental)", 207, 24, 182, 390);
+    button(w, L"&Correction options...", 255, 454, 180, 230);
+    label(w, L"Windows integration", 24, 254, 650);
+    checkbox(w, L"Start with &Windows", 204, 24, 288, 660);
+    checkbox(w, L"Start with Windows as ad&ministrator", 206, 24, 324, 660);
+    checkbox(w, L"&Keep screen awake", 205, 24, 360, 660);
+    page();
+
+    label(w, L"Default language cycle — top to bottom", 24, 76, 650);
+    control(w, L"LISTBOX", L"", WS_TABSTOP | WS_VSCROLL | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT | WS_BORDER,
+            220, 24, 108, 410, 240);
+    button(w, L"Move u&p", 232, 454, 108, 110);
+    button(w, L"Move &down", 233, 574, 108, 110);
+    checkbox(w, L"&Include in cycle", 230, 454, 154, 230);
+    label(w, L"Direct layout shortcut", 454, 206, 230);
+    hotkeyEdit(app, w, 231, 454, 234, 230);
+    label(w, L"Backspace / Delete clears it", 454, 270, 230);
+    button(w, L"Re&fresh layouts", 253, 454, 322, 230);
+    button(w, L"Languages for a &chat...", 259, 24, 378, 230);
+    label(w, L"Telegram / Telegram Web (Chrome) / Teams", 272, 382, 412);
+    page();
+
+    label(w, L"Click a shortcut field and press the desired keys", 24, 76, 660);
+    const wchar_t *names[] = {L"Next layout", L"Change case", L"Transliterate", L"Undo", L"Clipboard history", L"Screen capture"};
     for (int i = 0; i < 6; ++i)
     {
-        label(w, names[i], 420, 48 + i * 30, 115);
+        label(w, names[i], 24, 116 + i * 40, 180);
-        hotkeyEdit(app, w, 210 + i, 540, 44 + i * 30, 220);
+        hotkeyEdit(app, w, 210 + i, 230, 112 + i * 40, 454);
     }
-    checkbox(w, L"Open editor after screen capt&ure", 209, 420, 224, 340);
+    checkbox(w, L"Open editor after screen capt&ure", 209, 24, 378, 660);
-    checkbox(w, L"Automatic correction (e&xperimental)", 207, 18, 210, 395);
+    page();
-    label(w, L"Layout cycle — top to bottom", 18, 240, 400);
+
-    control(w, L"LISTBOX", L"", WS_TABSTOP | WS_VSCROLL | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT | WS_BORDER, 220,
+    checkbox(w, L"Record clip&board history", 203, 24, 80, 660);
-            18, 262, 470, 172);
+    label(w, L"History limits", 24, 140, 660);
-    button(w, L"Move u&p", 232, 504, 262, 120);
+    label(w, L"Items", 24, 176, 180);
-    button(w, L"Move &down", 233, 632, 262, 128);
+    label(w, L"Total MiB", 254, 176, 180);
-    checkbox(w, L"&Include in cycle", 230, 504, 300, 240);
+    label(w, L"Per item MiB", 484, 176, 180);
-    label(w, L"Direct layout shortcut", 504, 332, 240);
+    edit(w, 240, 24, 204, 200);
-    hotkeyEdit(app, w, 231, 504, 356, 256);
+    edit(w, 241, 254, 204, 200);
-    label(w, L"Backspace / Delete clears a shortcut", 504, 382, 256);
+    edit(w, 242, 484, 204, 200);
-    button(w, L"Re&fresh layouts", 253, 504, 408, 150);
+    button(w, L"Clear &history...", 254, 24, 258, 200);
-    label(w, L"History limits", 18, 444);
+    label(w, L"Exclude applications (process names, comma-separated)", 24, 330, 660);
-    label(w, L"Items", 18, 478, 50);
+    edit(w, 243, 24, 362, 660);
-    edit(w, 240, 70, 474, 90);
+    page();
-    label(w, L"Total MiB", 180, 478, 75);
+
-    edit(w, 241, 260, 474, 90);
+    label(w, L"Additional tools and preferences", 24, 76, 660);
-    label(w, L"Per item MiB", 370, 478, 100);
+    button(w, L"S&nippets...", 252, 24, 116, 210);
-    edit(w, 242, 475, 474, 80);
+    label(w, L"Manage reusable text and expansion triggers.", 254, 120, 430);
-    button(w, L"Clear &history…", 254, 580, 474, 180);
+    button(w, L"OCR op&tions...", 257, 24, 180, 210);
-    label(w, L"Exclude applications (process names, comma-separated)", 18, 516, 700);
+    label(w, L"Configure text recognition from images.", 254, 184, 430);
-    edit(w, 243, 18, 544, 742);
+    button(w, L"S&ync...", 258, 24, 244, 210);
-    button(w, L"&Auto-correction options…", 255, 18, 575, 240);
+    label(w, L"Synchronize preferences between computers.", 254, 248, 430);
-    button(w, L"View l&og…", 256, 278, 575, 220);
+    button(w, L"View l&og...", 256, 24, 308, 210);
-    button(w, L"OCR op&tions…", 257, 518, 575, 242);
+    label(w, L"Inspect recent operations and diagnostics.", 254, 312, 430);
-    button(w, L"Impo&rt settings…", 250, 18, 606, 145);
+    checkbox(w, L"Write lo&g", 208, 24, 378, 210);
-    button(w, L"&Export settings…", 251, 173, 606, 145);
+    page();
-    button(w, L"S&nippets…", 252, 328, 606, 110);
+
-    button(w, L"S&ync...", 258, 448, 606, 90);
+    button(w, L"Impo&rt...", 250, 18, 466, 125);
-    button(w, L"&Save", IDOK, 548, 606, 100);
+    button(w, L"&Export...", 251, 155, 466, 125);
-    button(w, L"&Cancel", IDCANCEL, 660, 606, 100);
+    button(w, L"&Save", IDOK, 490, 466, 100);
-    fillSettings(w, (SettingsView *)GetWindowLongPtrW(w, GWLP_USERDATA));
+    button(w, L"&Cancel", IDCANCEL, 602, 466, 100);
+    fillSettings(w, v);
+    TabCtrl_SetCurSel(tabs, 0);
+    selectSettingsPage(w, v);
     if (visible)
     {
         showRequestedWindow(w);
@@ -1868,22 +2089,34 @@ void showSnippets(App &app)
         SetForegroundWindow(app.snippetsWindow);
         return;
     }
-    HWND w = makeWindow(app, L"KSwitcher.Snippets", L"Text snippets", snippetProc, 740, 520);
+    HWND w = makeWindow(app, L"KSwitcher.Snippets", L"Text snippets", snippetProc, 740, 620);
     app.snippetsWindow = w;
     label(w, L"Triggers", 16, 16);
     control(w, L"LISTBOX", L"", WS_TABSTOP | WS_VSCROLL | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT | WS_BORDER, 301,
-            16, 44, 200, 380);
+            16, 44, 200, 480);
-    button(w, L"&Add", 310, 16, 438, 90);
+    button(w, L"&Add", 310, 16, 538, 90);
-    button(w, L"&Delete", 311, 116, 438, 100);
+    button(w, L"&Delete", 311, 116, 538, 100);
     label(w, L"&Trigger (for example ;addr)", 236, 16, 470);
     edit(w, 302, 236, 44, 488);
-    label(w, L"&Replacement text", 236, 82, 480);
+    control(w, L"BUTTON", L"Only in these &applications (unchecked: everywhere)", WS_TABSTOP | BS_AUTOCHECKBOX, 314, 236, 82, 488, 24);
-    edit(w, 303, 236, 110, 488, 270, ES_MULTILINE | ES_WANTRETURN | ES_AUTOVSCROLL | WS_VSCROLL);
+    edit(w, 315, 236, 112, 488);
-    control(w, L"STATIC", L"{cursor}: caret; {enter}: press Enter after insertion.\nUse {{cursor}} / {{enter}} for literal markers.", 0, 0, 236, 392, 488, 36);
+    control(w, L"COMBOBOX", L"", WS_TABSTOP | CBS_DROPDOWNLIST | WS_VSCROLL, 316, 236, 148, 364, 200);
-    button(w, L"Insert cursor &marker", 312, 236, 430, 190);
+    button(w, L"Add a&pp", 317, 612, 145, 112);
-    button(w, L"Insert &Enter marker", 313, 436, 430, 190);
+    std::set<std::wstring> apps;
-    button(w, L"&Save", IDOK, 510, 478, 100);
+    EnumWindows([](HWND candidate, LPARAM context)->BOOL {
-    button(w, L"&Cancel", IDCANCEL, 624, 478, 100);
+        if (IsWindowVisible(candidate)) { auto name = processName(candidate); if (!name.empty()) ((std::set<std::wstring>*)context)->insert(lower(name) + L".exe"); }
+        return TRUE;
+    }, (LPARAM)&apps);
+    for (const auto &name : apps) SendDlgItemMessageW(w, 316, CB_ADDSTRING, 0, (LPARAM)name.c_str());
+    SendDlgItemMessageW(w, 316, CB_SETCURSEL, 0, 0);
+    label(w, L"Process names, comma-separated; e.g. chrome.exe, ms-teams.exe", 236, 182, 488);
+    label(w, L"&Replacement text", 236, 212, 480);
+    edit(w, 303, 236, 240, 488, 240, ES_MULTILINE | ES_WANTRETURN | ES_AUTOVSCROLL | WS_VSCROLL);
+    control(w, L"STATIC", L"{cursor}: caret; {enter}: press Enter after insertion.\nUse {{cursor}} / {{enter}} for literal markers.", 0, 0, 236, 492, 488, 36);
+    button(w, L"Insert cursor &marker", 312, 236, 530, 190);
+    button(w, L"Insert &Enter marker", 313, 436, 530, 190);
+    button(w, L"&Save", IDOK, 510, 578, 100);
+    button(w, L"&Cancel", IDCANCEL, 624, 578, 100);
     fillSnippets(w, (SnippetView *)GetWindowLongPtrW(w, GWLP_USERDATA));
     showRequestedWindow(w);
     SetForegroundWindow(w);

src/update.h

@@ -2,7 +2,7 @@
 #include "platform.h"
 namespace ks
 {
-inline constexpr wchar_t AppVersion[] = L"0.6.41";
+inline constexpr wchar_t AppVersion[] = L"0.6.52";
 inline constexpr UINT UpdateMessage = WM_APP + 7;
 inline constexpr UINT UpdateCheckIntervalMs = 6 * 60 * 60 * 1000;
 inline constexpr UINT UpdateNotificationRetryMs = 5 * 60 * 1000;

src/utilities.h

@@ -0,0 +1,41 @@
+#pragma once
+#include <algorithm>
+#include <cwchar>
+#include <filesystem>
+#include <string>
+#include <vector>
+
+namespace ks
+{
+// Scan each time the menu opens, relative to the resident executable, not its working directory.
+inline std::vector<std::filesystem::path> discoverUtilities(const std::filesystem::path &folder,
+                                                          std::error_code &error)
+{
+    error.clear();
+    std::vector<std::filesystem::path> result;
+    std::filesystem::directory_iterator it(folder, error), end;
+    if (error == std::errc::no_such_file_or_directory) error.clear();
+    while (!error && it != end)
+    {
+        std::error_code entryError;
+        if (_wcsicmp(it->path().extension().c_str(), L".exe") == 0 && it->is_regular_file(entryError))
+            result.push_back(it->path());
+        it.increment(error);
+    }
+    if (error) result.clear();
+    std::sort(result.begin(), result.end(), [](const auto &a, const auto &b) {
+        return _wcsicmp(a.filename().c_str(), b.filename().c_str()) < 0;
+    });
+    return result;
+}
+inline std::wstring utilityMenuLabel(const std::filesystem::path &path)
+{
+    std::wstring label;
+    for (wchar_t ch : path.stem().wstring())
+    {
+        label += ch;
+        if (ch == L'&') label += ch; // Win32 uses ampersands for access keys.
+    }
+    return label;
+}
+}

src/viber_ocr.inc

@@ -0,0 +1,82 @@
+// Experimental Viber header OCR; never called on the keyboard hook thread.
+#include <uiautomation.h>
+#include <mutex>
+namespace ks {
+namespace {
+std::mutex viberMutex;
+HWND viberWindow{};
+std::wstring viberKey;
+ULONGLONG viberTime{};
+std::wstring elementClass(IUIAutomationElement *e) {
+ BSTR s{}; e->get_CurrentClassName(&s); std::wstring out=s?s:L""; SysFreeString(s); return out;
+}
+bool findViberHeader(IUIAutomationTreeWalker *walker,IUIAutomationElement *e,RECT &pane,RECT &search,int depth,int &budget) {
+ if(depth>5 || --budget<0) return false;
+ bool stack=elementClass(e).starts_with(L"StackView_");
+ Com<IUIAutomationElement> child;walker->GetFirstChildElement(e,child.out());
+ bool found=false,info=false;
+ while(child.p && --budget>0) {
+  if(stack) {
+   auto name=elementClass(child.p);
+   if(name.starts_with(L"SearchButton_")){child->get_CurrentBoundingRectangle(&search);found=true;}
+   if(name.starts_with(L"InfoButton_")) info=true;
+  } else if(findViberHeader(walker,child.p,pane,search,depth+1,budget)) return true;
+  Com<IUIAutomationElement> next;walker->GetNextSiblingElement(child.p,next.out());
+  child.p->Release();child.p=next.p;next.p=nullptr;
+ }
+ if(found && info){e->get_CurrentBoundingRectangle(&pane);return true;}
+ return false;
+}
+Pixels viberHeader(HWND window) {
+ if(!IsWindow(window)||IsIconic(window)) return {};
+ Com<IUIAutomation2> automation;
+ check(CoCreateInstance(CLSID_CUIAutomation8,nullptr,CLSCTX_INPROC_SERVER,IID_IUIAutomation2,(void**)automation.out()));
+ automation->put_ConnectionTimeout(200);automation->put_TransactionTimeout(200);
+ Com<IUIAutomationElement> root;check(automation->ElementFromHandle(window,root.out()));
+ Com<IUIAutomationTreeWalker> walker;check(automation->get_RawViewWalker(walker.out()));
+ RECT pane{},search{},rect{};int budget=160;
+ if(!findViberHeader(walker.p,root.p,pane,search,0,budget)||!GetWindowRect(window,&rect)) return {};
+ double scale=GetDpiForWindow(window)/96.0;
+ int x=pane.left+int(76*scale)-rect.left,y=search.top-int(12*scale)-rect.top;
+ int width=search.left-int(12*scale)-rect.left-x,height=int(28*scale);
+ int ww=rect.right-rect.left,wh=rect.bottom-rect.top;
+ if(width<30||height<10||x<0||y<0||x+width>ww||y+height>wh||uint64_t(ww)*wh>16000000) return {};
+ HDC dc=CreateCompatibleDC(nullptr);BITMAPINFO bi{};bi.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
+ bi.bmiHeader.biWidth=ww;bi.bmiHeader.biHeight=-wh;bi.bmiHeader.biPlanes=1;bi.bmiHeader.biBitCount=32;
+ void *bits{};HBITMAP bitmap=CreateDIBSection(dc,&bi,DIB_RGB_COLORS,&bits,nullptr,0);
+ if(!bitmap){DeleteDC(dc);return {};}
+ auto old=SelectObject(dc,bitmap);Pixels p;
+ if(PrintWindow(window,dc,2)) {
+  p.width=width;p.height=height;p.bgra.resize(size_t(width)*height*4);
+  for(int row=0;row<height;++row) memcpy(p.bgra.data()+size_t(row)*width*4,(BYTE*)bits+(size_t(y+row)*ww+x)*4,size_t(width)*4);
+ }
+ SelectObject(dc,old);DeleteObject(bitmap);DeleteDC(dc);return p;
+}
+}
+std::wstring cachedViberChat(HWND window) {
+ std::lock_guard lock(viberMutex);
+ return window==viberWindow && GetTickCount64()-viberTime<2000 ? viberKey : L"";
+}
+std::wstring recognizeViberChat(HWND window,const Settings &settings) {
+ std::wstring key;
+ try {
+  auto hr=CoInitializeEx(nullptr,COINIT_MULTITHREADED);
+  struct Apartment {bool owned;~Apartment(){if(owned)CoUninitialize();}} apartment{SUCCEEDED(hr)};
+  auto context=SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
+  struct Dpi {DPI_AWARENESS_CONTEXT old;~Dpi(){if(old)SetThreadDpiAwarenessContext(old);}} dpi{context};
+  auto before=viberHeader(window);
+  if(!before.bgra.empty()) {
+   Settings options=settings;options.useTesseract=true;
+   Clip clip;clip.formats.push_back(imageDib(before));
+   auto title=recognizeText(clip,options);
+   while(!title.empty() && iswspace(title.back())) title.pop_back();
+   while(!title.empty() && iswspace(title.front())) title.erase(0,1);
+   auto after=viberHeader(window);
+   if(!title.empty() && title.size()<512 && title.find_first_of(L"\r\n")==title.npos && before.width==after.width && before.height==after.height && before.bgra==after.bgra)
+    key=L"viber\n"+title;
+  }
+ } catch(...) {}
+ {std::lock_guard lock(viberMutex);viberWindow=window;viberKey=key;viberTime=GetTickCount64();}
+ return key;
+}
+}

tests/chat_profiles.cpp

@@ -0,0 +1,225 @@
+#include "app.h"
+#include "ocr.h"
+#include "screenshot.h"
+#include <iostream>
+#include <commctrl.h>
+
+namespace
+{
+int passed{};
+void require(bool ok, const char *message)
+{
+    if (!ok) throw std::runtime_error(message);
+    ++passed;
+}
+void contextChecks()
+{
+    ks::Settings scoped;
+    scoped.snippets = {{L";sig", L"Global", L"global"},
+        {L";sig", L"Work", L"teams", {L"MS-Teams.EXE", L"OUTLOOK.exe"}},
+        {L";sig", L"Personal", L"telegram", {L"telegram"}}};
+    ks::validateSettings(scoped);
+    require(ks::snippetAppPriority(scoped.snippets[1], L"ms-teams") > ks::snippetAppPriority(scoped.snippets[0], L"ms-teams"), "app snippet precedes global regardless of list order");
+    require(ks::snippetAppPriority(scoped.snippets[1], L"Telegram.exe") == 0, "restricted snippet cannot run in another app");
+    require(ks::snippetAppPriority(scoped.snippets[0], L"") == 1, "legacy/global snippets remain available");
+    auto scopedRoundtrip = ks::decodeSettings(ks::encodeSettings(scoped), {});
+    require(scopedRoundtrip.snippets[1].apps == std::vector<std::wstring>{L"ms-teams", L"outlook"}, "scopes normalize and persist");
+    require(scopedRoundtrip.snippets[0].apps.empty(), "absent scope remains global");
+    auto collision = scoped; collision.snippets.push_back({L";SIG", L"Ambiguous", L"other", {L"outlook.exe"}});
+    bool collisionRejected=false;try { ks::validateSettings(collision); } catch(...) { collisionRejected=true; }
+    require(collisionRejected, "overlapping app lists with same trigger rejected");
+    auto emptyScope = scoped; emptyScope.snippets[1].apps={L""};
+    bool emptyRejected=false;try { ks::validateSettings(emptyScope); } catch(...) { emptyRejected=true; }
+    require(emptyRejected, "empty explicit restriction cannot become global");
+    require(ks::telegramWebKey(L"https://web.telegram.org/k/#@Example") == L"telegram-web\n@example", "Telegram Web username normalized");
+    require(ks::telegramWebKey(L"web.telegram.org/a/#-123456") == L"telegram-web\n-123456", "Telegram Web numeric peer");
+    for (const auto *url : {L"https://web.telegram.org/k/", L"https://web.telegram.org.evil/k/#@example",
+         L"http://web.telegram.org/k/#@example", L"https://evil/web.telegram.org/k/#@example",
+         L"https://web.telegram.org/k/#@example?foo", L"https://web.telegram.org/k/#@",
+         L"https://web.telegram.org/k/#-", L"https://web.telegram.org/k/#settings"})
+        require(ks::telegramWebKey(url).empty(), "Reject non-chat or untrusted Telegram Web URL");
+    const auto key = ks::chatKey(L"Telegram.exe", L"\u200eТестовий чат \u2013 (12)");
+    require(key == L"telegram\nТестовий чат", "Telegram unread suffix");
+    require(ks::chatKey(L"Telegram", L"Тестовий чат") == key, "stable unread profile");
+    require(ks::chatKey(L"Telegram", L"Team (2026)") == L"telegram\nTeam (2026)", "preserve parentheses");
+    require(ks::chatKey(L"Telegram", L"Telegram").empty(), "no profile on home");
+    require(ks::chatKey(L"Viber", L"Rakuten Viber").empty(), "Viber generic window title is not a chat");
+    require(ks::chatKey(L"ms-teams", L"Chat | Alice | Microsoft Teams") == L"ms-teams\nAlice", "Teams chat");
+    require(ks::chatKey(L"ms-teams", L"Calendar | Alice | Microsoft Teams").empty(), "Teams calendar excluded");
+    require(ks::chatKey(L"ms-teams", L"Chat | Microsoft Teams").empty(), "Teams chat home excluded");
+    require(ks::chatKey(L"other", L"Chat | Alice | Microsoft Teams").empty(), "app identity required");
+    ks::Settings settings;
+    settings.cycle = {L"win:04090409", L"win:04220422", L"win:04190419"};
+    settings.chatCycles[key] = {settings.cycle[1], settings.cycle[0]};
+    settings.chatCycles[L"viber\nТестовий контакт"] = {settings.cycle[1], settings.cycle[0]};
+    settings.chatCycles[L"telegram-web\n@example"] = {settings.cycle[0], settings.cycle[1]};
+    std::vector<ks::Layout> installed(3);
+    for (size_t i = 0; i < installed.size(); ++i)
+    {
+        installed[i].id = settings.cycle[i];
+        installed[i].handle = (HKL)(uintptr_t)(i + 1);
+    }
+    auto subset = settings.chatCycles[key];
+    require(ks::nextChatLayout(subset, installed, installed[1].handle, false) == installed[0].handle, "cycle within subset");
+    require(ks::nextChatLayout(subset, installed, installed[0].handle, false) == installed[1].handle, "wrap skips excluded language");
+    require(ks::nextChatLayout(subset, installed, installed[2].handle, false) == installed[1].handle, "outside subset enters first language");
+    require(ks::nextChatLayout(settings.cycle, installed, installed[0].handle, true) == installed[2].handle, "reverse wraps");
+    require(ks::nextChatLayout({settings.cycle[1]}, installed, installed[0].handle, false) == installed[1].handle, "single language selects allowed layout");
+    require(!ks::nextChatLayout({L"win:04070407"}, installed, installed[0].handle, false), "missing layout is not activated");
+    require(ks::nextConversionLayout(L"", installed, {1}, 0) == 1, "conversion uses single allowed language");
+    require(ks::chatCycle(settings, key, installed) == settings.chatCycles[key], "profile order");
+    require(ks::chatCycle(settings, L"telegram\nOther", installed) == settings.cycle, "unknown fallback");
+    require(ks::decodeSettings(ks::encodeSettings(settings), installed).chatCycles == settings.chatCycles, "Unicode roundtrip");
+    require(ks::decodeSettings({}, installed).chatCycles.empty(), "old defaults without profiles");
+    auto withoutProfiles = settings;
+    withoutProfiles.chatCycles.clear();
+    require(ks::sharedSyncSettings(settings) == ks::sharedSyncSettings(withoutProfiles), "profiles excluded from sync");
+    auto restored = ks::restoreSyncSettings(ks::sharedSyncSettings(settings), settings, installed, false);
+    require(restored.chatCycles == settings.chatCycles, "sync preserves local profiles");
+    settings.chatCycles[key] = {settings.cycle[1]};
+    require(ks::chatCycle(settings, key, installed).size() == 1, "one-language profile");
+    settings.chatCycles[key] = {L"win:04070407"};
+    require(ks::chatCycle(settings, key, installed) == settings.cycle, "missing layouts fallback");
+    settings.chatCycles[key] = {};
+    bool rejected = false;
+    try { ks::encodeSettings(settings); } catch (...) { rejected = true; }
+    require(rejected, "empty profile rejected");
+    settings.chatCycles[key] = {settings.cycle[0], settings.cycle[0]};
+    rejected = false;
+    try { ks::encodeSettings(settings); } catch (...) { rejected = true; }
+    require(rejected, "duplicate profile layout rejected");
+    ks::ChatSwitchHook hook;
+    require(hook.update(VK_SPACE, true, MOD_WIN, false) == 0, "unprofiled Win+Space passes");
+    require(hook.update(VK_SPACE, true, MOD_WIN, true) == 1, "Win+Space forward");
+    require(hook.update(VK_SPACE, true, MOD_WIN, true) == -1, "consume repeat");
+    require(hook.update(VK_SPACE, false, 0, false) == -1, "release after profile change");
+    require(hook.update(VK_SPACE, true, MOD_WIN | MOD_SHIFT, true) == 2, "reverse cycle");
+    hook.update(VK_SPACE, false, 0, true);
+    require(hook.update(VK_LSHIFT, true, MOD_ALT, true) == 1, "Alt then Shift");
+    hook.update(VK_LSHIFT, false, 0, true);
+    require(hook.update(VK_LMENU, true, MOD_SHIFT, true) == 1, "Shift then Alt");
+    hook.update(VK_LMENU, false, 0, true);
+    require(hook.update(VK_LSHIFT, true, MOD_ALT | MOD_CONTROL, true) == 0, "do not consume Ctrl+Alt+Shift");
+    require(hook.update('A', true, MOD_ALT, true) == 0, "ordinary keys pass");
+}
+}
+int main()
+{
+    CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
+    auto root = std::filesystem::temp_directory_path() / (L"KSwitcher-chat-tests-" + std::to_wstring(GetCurrentProcessId()));
+    try
+    {
+        contextChecks();
+        {
+            ks::App app(GetModuleHandleW(nullptr), true, root);
+            require(!app.layouts.empty(), "installed layouts available");
+            app.settings.toggle = app.settings.casing = app.settings.translit = app.settings.undo = L"";
+            app.settings.clipboard = app.settings.screenshot = L"";
+            app.settings.direct.assign(app.layouts.size(), L"");
+            app.settings.history = app.settings.autoCorrect = false;
+            const std::wstring key = L"telegram\n! Fixture chat";
+            app.settings.chatCycles[key] = {app.layouts[0].id};
+            ks::showSettings(app);
+            HWND parent = app.settingsWindow;
+            HWND tabs = GetDlgItem(parent, 260);
+            require(tabs && TabCtrl_GetItemCount(tabs) == 5, "five settings categories");
+            for (int page = 0; page < 5; ++page)
+            {
+                TabCtrl_SetCurSel(tabs, page);
+                NMHDR notification{tabs, 260, TCN_SELCHANGE};
+                SendMessageW(parent, WM_NOTIFY, 260, (LPARAM)&notification);
+                std::vector<RECT> boxes;
+                for (HWND child = GetWindow(parent, GW_CHILD); child; child = GetWindow(child, GW_HWNDNEXT))
+                {
+                    if (!(GetWindowLongPtrW(child, GWL_STYLE) & WS_VISIBLE)) continue;
+                    RECT rect{}; GetWindowRect(child, &rect);
+                    for (const auto &other : boxes)
+                    {
+                        RECT overlap{};
+                        require(!IntersectRect(&overlap, &rect, &other), "visible settings controls never overlap");
+                    }
+                    boxes.push_back(rect);
+                }
+                RedrawWindow(parent, nullptr, nullptr, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN);
+                RECT rect{}; GetClientRect(parent, &rect);
+                HDC dc = GetDC(parent);
+                auto clip = ks::screenshotClip(dc, rect.right, rect.bottom, {});
+                ReleaseDC(parent, dc);
+                ks::atomicWrite(std::filesystem::path(ks::executable()).parent_path() / (L"settings-tab-" + std::to_wstring(page) + L".png"),
+                                ks::encodePng(ks::decodeImage(clip)));
+            }
+            TabCtrl_SetCurSel(tabs, 1);
+            NMHDR notification{tabs, 260, TCN_SELCHANGE};
+            SendMessageW(parent, WM_NOTIFY, 260, (LPARAM)&notification);
+            SendMessageW(parent, WM_COMMAND, 259, 0);
+            HWND dialog = FindWindowW(L"KSwitcher.ChatLanguages", nullptr);
+            require(dialog && !IsWindowEnabled(parent), "chat dialog opens with disabled parent");
+            int index = (int)SendDlgItemMessageW(dialog, 710, LB_FINDSTRINGEXACT, -1, (LPARAM)L"Telegram: ! Fixture chat");
+            require(index >= 0, "saved chat listed");
+            SendDlgItemMessageW(dialog, 710, LB_SETCURSEL, index, 0);
+            SendMessageW(dialog, WM_COMMAND, MAKEWPARAM(710, LBN_SELCHANGE), 0);
+            require(SendDlgItemMessageW(dialog, 711, LB_GETSELCOUNT, 0, 0) == 1, "saved single language selected");
+            RedrawWindow(dialog, nullptr, nullptr, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN);
+            RECT rect{}; GetClientRect(dialog, &rect);
+            HDC dc = GetDC(dialog);
+            auto clip = ks::screenshotClip(dc, rect.right, rect.bottom, {});
+            ReleaseDC(dialog, dc);
+            ks::atomicWrite(std::filesystem::path(ks::executable()).parent_path() / L"chat-languages.png",
+                            ks::encodePng(ks::decodeImage(clip)));
+            SendDlgItemMessageW(dialog, 711, LB_SETSEL, TRUE, -1);
+            SendMessageW(dialog, WM_COMMAND, IDCANCEL, 0);
+            require(!IsWindow(dialog) && IsWindowEnabled(parent), "cancel closes dialog");
+            SendMessageW(parent, WM_COMMAND, 259, 0);
+            dialog = FindWindowW(L"KSwitcher.ChatLanguages", nullptr);
+            index = (int)SendDlgItemMessageW(dialog, 710, LB_FINDSTRINGEXACT, -1, (LPARAM)L"Telegram: ! Fixture chat");
+            SendDlgItemMessageW(dialog, 710, LB_SETCURSEL, index, 0);
+            SendMessageW(dialog, WM_COMMAND, MAKEWPARAM(710, LBN_SELCHANGE), 0);
+            require(SendDlgItemMessageW(dialog, 711, LB_GETSELCOUNT, 0, 0) == 1, "cancel discards language edits");
+            SendDlgItemMessageW(dialog, 711, LB_SETSEL, TRUE, -1);
+            SendMessageW(dialog, WM_COMMAND, IDOK, 0);
+            require(!IsWindow(dialog) && IsWindowEnabled(parent), "profile applies to settings draft");
+            SendMessageW(parent, WM_COMMAND, IDOK, 0);
+            require(!app.settingsWindow && app.settings.chatCycles.at(key).size() == app.layouts.size(), "settings saves selected languages");
+            require(ks::loadSettings(root / L"settings.json", app.layouts).chatCycles == app.settings.chatCycles, "profile saved to disk");
+            ks::showSettings(app);
+            parent = app.settingsWindow;
+            SendMessageW(parent, WM_COMMAND, 259, 0);
+            dialog = FindWindowW(L"KSwitcher.ChatLanguages", nullptr);
+            index = (int)SendDlgItemMessageW(dialog, 710, LB_FINDSTRINGEXACT, -1, (LPARAM)L"Telegram: ! Fixture chat");
+            SendDlgItemMessageW(dialog, 710, LB_SETCURSEL, index, 0);
+            SendMessageW(dialog, WM_COMMAND, MAKEWPARAM(710, LBN_SELCHANGE), 0);
+            SendMessageW(dialog, WM_COMMAND, 713, 0);
+            SendMessageW(parent, WM_COMMAND, IDOK, 0);
+            require(!app.settings.chatCycles.contains(key), "remove profile restores default");
+            app.settings.snippets = {{L";scope", L"Example", L"scope-fixture"}};
+            ks::showSnippets(app);
+            HWND snippets = app.snippetsWindow;
+            SendDlgItemMessageW(snippets,301,LB_SETCURSEL,0,0);
+            SendMessageW(snippets,WM_COMMAND,MAKEWPARAM(301,LBN_SELCHANGE),0);
+            require(IsDlgButtonChecked(snippets,314)==BST_UNCHECKED, "old snippet shows everywhere");
+            CheckDlgButton(snippets,314,BST_CHECKED);
+            SendMessageW(snippets,WM_COMMAND,314,0);
+            SetDlgItemTextW(snippets,315,L"Notepad.exe, MS-Teams.EXE");
+            SendMessageW(snippets,WM_COMMAND,IDOK,0);
+            require(!app.snippetsWindow && app.settings.snippets[0].apps==std::vector<std::wstring>{L"notepad",L"ms-teams"}, "snippet editor saves selected applications");
+            ks::showSnippets(app);snippets=app.snippetsWindow;
+            SendDlgItemMessageW(snippets,301,LB_SETCURSEL,0,0);
+            SendMessageW(snippets,WM_COMMAND,MAKEWPARAM(301,LBN_SELCHANGE),0);
+            require(IsDlgButtonChecked(snippets,314)==BST_CHECKED, "scope restored when reopening editor");
+            RedrawWindow(snippets,nullptr,nullptr,RDW_INVALIDATE|RDW_UPDATENOW|RDW_ALLCHILDREN);
+            RECT snippetRect{};GetClientRect(snippets,&snippetRect);
+            HDC snippetDc=GetDC(snippets);
+            auto snippetImage=ks::screenshotClip(snippetDc,snippetRect.right,snippetRect.bottom,{});
+            ReleaseDC(snippets,snippetDc);
+            ks::atomicWrite(std::filesystem::path(ks::executable()).parent_path()/L"snippet-scopes.png",ks::encodePng(ks::decodeImage(snippetImage)));
+            SetDlgItemTextW(snippets,315,L"chrome.exe");
+            SendMessageW(snippets,WM_COMMAND,IDCANCEL,0);
+            require(app.settings.snippets[0].apps==std::vector<std::wstring>{L"notepad",L"ms-teams"}, "cancel preserves existing scope");
+        }
+        std::filesystem::remove_all(root);
+        std::cout << "Passed " << passed << " chat profile checks\n";
+        CoUninitialize();
+        return 0;
+    }
+    catch (const std::exception &e) { std::cerr << "FAIL: " << e.what() << '\n'; CoUninitialize(); return 1; }
+}

tests/far_snippets.cpp

@@ -0,0 +1,133 @@
+// Explicit Windows integration test. Opens an isolated Far profile and never
+// types into an existing Far window. Requires Far Manager at its default path.
+#include "app.h"
+#include <cstdlib>
+#include <cwctype>
+#include <fstream>
+#include <future>
+
+namespace ks {
+struct InputRegressionAccess {
+    static void runQueued(App &app) {
+        std::function<void()> job;
+        { std::lock_guard lock(app.jobsMutex);
+          if (app.jobs.empty()) throw std::runtime_error("snippet did not queue");
+          job=std::move(app.jobs.front());app.jobs.pop_front(); }
+        auto future=std::async(std::launch::async,[job=std::move(job)] {
+            CoInitializeEx(nullptr,COINIT_APARTMENTTHREADED);job();CoUninitialize();
+        });
+        while(future.wait_for(std::chrono::milliseconds(5))!=std::future_status::ready) {
+            MSG message{};while(PeekMessageW(&message,nullptr,0,0,PM_REMOVE)) {
+                TranslateMessage(&message);DispatchMessageW(&message);
+            }
+        }
+        future.get();app.replayTyping();
+    }
+};
+}
+int WINAPI wWinMain(HINSTANCE instance,HINSTANCE,PWSTR,int) {
+    auto base=std::filesystem::path(ks::executable()).parent_path();
+    std::ofstream log(base/L"far-snippets.log");
+    int checks=0;
+    auto require=[&](bool ok,const char *message) {
+        if(!ok)throw std::runtime_error(message);
+        ++checks;log<<"PASS "<<message<<'\n';log.flush();
+    };
+    auto folder=std::filesystem::temp_directory_path()/(L"ks-far-snippets-"+ks::newSnippetId());
+    std::filesystem::create_directories(folder);
+    CoInitializeEx(nullptr,COINIT_APARTMENTTHREADED);
+    ks::Clip saved;bool captured=false;PROCESS_INFORMATION child{};
+    HANDLE input=INVALID_HANDLE_VALUE,output=INVALID_HANDLE_VALUE;
+    HWND farWindow{};
+    HWND owner=CreateWindowExW(0,L"STATIC",L"Far snippet fixture clipboard",0,0,0,0,0,HWND_MESSAGE,nullptr,instance,nullptr);
+    auto originalForeground=GetForegroundWindow();
+    int result=1;
+    try {
+        saved=ks::readClipboard(owner,128*1024*1024);captured=true;
+        auto sentinel=ks::textClip(L"KSwitcher Far fixture clipboard");
+        sentinel.formats.push_back({0,L"ExcludeClipboardContentFromMonitorProcessing",ks::Bytes{0}});
+        ks::writeClipboard(owner,sentinel);
+        const auto programFiles=_wgetenv(L"ProgramFiles");
+        if(!programFiles)throw std::runtime_error("ProgramFiles is unavailable");
+        auto farExecutable=std::filesystem::path(programFiles)/L"Far Manager/Far.exe";
+        std::wstring command=L"\""+farExecutable.wstring()+L"\" -m -p -s \""+folder.wstring()+L"\\profile\"";
+        // A GUID-length working directory can horizontally scroll Far's command
+        // line, making absolute cursor-cell assertions invalid. Keep the prompt
+        // short; profile and application data still live in the unique fixture.
+        auto workingDirectory=folder.root_path();
+        STARTUPINFOW startup{sizeof(startup)};startup.dwFlags=STARTF_USESHOWWINDOW;startup.wShowWindow=SW_HIDE;
+        require(CreateProcessW(nullptr,command.data(),nullptr,nullptr,FALSE,CREATE_NEW_CONSOLE,nullptr,workingDirectory.c_str(),&startup,&child),"start isolated Far without plugins/macros");
+        CloseHandle(child.hThread);Sleep(1800);
+        require(AttachConsole(child.dwProcessId),"attach isolated console for test-only input and observation");
+        input=CreateFileW(L"CONIN$",GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,nullptr,OPEN_EXISTING,0,nullptr);
+        output=CreateFileW(L"CONOUT$",GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,nullptr,OPEN_EXISTING,0,nullptr);
+        require(input!=INVALID_HANDLE_VALUE && output!=INVALID_HANDLE_VALUE,"open isolated console buffers");
+        auto target=GetConsoleWindow();farWindow=target;ShowWindow(target,SW_SHOW);
+        require(ks::activateWindow(target),"activate only the isolated Far window");
+        auto key=[&](WORD vk,wchar_t c=0,DWORD mods=0) {
+            INPUT_RECORD records[2]{};
+            for(int i=0;i<2;++i) {
+                auto &r=records[i];r.EventType=KEY_EVENT;
+                r.Event.KeyEvent={BOOL(i==0),1,vk,WORD(MapVirtualKeyW(vk,MAPVK_VK_TO_VSC)),{c},mods};
+            }
+            DWORD written{};
+            if(!WriteConsoleInputW(input,records,2,&written)||written!=2)throw std::runtime_error("test input failed");
+            Sleep(60);
+        };
+        auto position=[&] {CONSOLE_SCREEN_BUFFER_INFO info{};if(!GetConsoleScreenBufferInfo(output,&info))throw std::runtime_error("console position unavailable");return info.dwCursorPosition;};
+        auto row=[&] {
+            CONSOLE_SCREEN_BUFFER_INFO info{};GetConsoleScreenBufferInfo(output,&info);
+            std::wstring text(info.dwSize.X,L' ');DWORD count{};
+            if(!ReadConsoleOutputCharacterW(output,text.data(),DWORD(text.size()),{0,info.dwCursorPosition.Y},&count))throw std::runtime_error("console row unavailable");
+            return text;
+        };
+        {
+            ks::App app(instance,false,folder/L"data");app.window=owner;
+            app.settings.history=false;app.settings.autoCorrect=false;app.settings.writeLog=true;
+            auto prepare=[&](wchar_t last=L'r') {
+                if(!ks::activateWindow(target))throw std::runtime_error("isolated Far lost foreground");
+                key(VK_ESCAPE);key('Y',0,LEFT_CTRL_PRESSED);key(VK_OEM_1,L':',SHIFT_PRESSED);key(WORD(towupper(last)),last);
+                app.run.reset();app.run.window=target;app.run.layout=ks::windowLayout(target);
+                app.run.at=GetTickCount64();app.run.keys=L":r";
+            };
+            auto expand=[&](const std::wstring &replacement) {
+                app.settings.snippets={{L":r",replacement}};
+                app.transform(0,0);ks::InputRegressionAccess::runQueued(app);Sleep(120);
+            };
+            for(int panels=0;panels<2;++panels) {
+                prepare();auto before=position();auto original=row();expand(L"rider .");
+                auto expected=original;expected.replace(before.X-2,2,L"rider .");expected.resize(original.size());
+                // Far's rightmost scroll indicator is redrawn rather than shifted.
+                require(row().substr(0,before.X+5)==expected.substr(0,before.X+5),"actual snippet replaces :r with rider .");
+                require(position().X==before.X+5,"successful expansion leaves cursor after replacement");
+                require(ks::readClipboard(owner).text()==sentinel.text(),"snippet restores original clipboard");
+                prepare(L'x');before=position();original=row();expand(L"rider .{enter}");
+                require(row()==original && position().X==before.X,"mismatched trigger restores original caret and never executes Enter");
+                prepare();before=position();original=row();expand(L"left{cursor}right");
+                require(row().substr(before.X-2,9)==L"leftright" && position().X==before.X+2,"cursor marker uses Far selection semantics");
+                prepare();before=position();original=row();expand(L"first\nsecond{enter}");
+                require(row()==original && position().X==before.X,"multiline console template rejected before changing text or caret");
+                prepare();before=position();original=row();expand(L"echo KSWITCHER_FAR_FIXTURE{enter}");
+                for(int wait=0;wait<30 && position().X!=before.X-2;++wait)Sleep(100);
+                require(position().X==before.X-2 && row().substr(before.X-2,2)==L"  ",
+                        "verified Enter runs only the harmless fixture echo and returns to an empty command line");
+                key('O',0,LEFT_CTRL_PRESSED);
+            }
+            app.window=nullptr;
+        }
+        log<<"Passed "<<checks<<" Far snippet integration checks\n";result=0;
+    }catch(const std::exception &e){log<<"FAIL "<<e.what()<<" win32="<<GetLastError()<<'\n';}
+    // A real user or clipboard synchronizer can copy during this explicit test.
+    // Never replace that newer content with the fixture's original snapshot.
+    const auto restoreSequence=GetClipboardSequenceNumber();
+    const bool restoreClipboard=GetClipboardOwner()==owner || (farWindow && ks::ownsClipboard(farWindow));
+    if(input!=INVALID_HANDLE_VALUE)CloseHandle(input);
+    if(output!=INVALID_HANDLE_VALUE)CloseHandle(output);
+    FreeConsole();
+    if(child.hProcess){TerminateProcess(child.hProcess,0);WaitForSingleObject(child.hProcess,5000);CloseHandle(child.hProcess);}
+    if(captured && restoreClipboard && GetClipboardSequenceNumber()==restoreSequence)
+        try{ks::writeClipboard(owner,saved);}catch(...){result=1;}
+    DestroyWindow(owner);
+    if(IsWindow(originalForeground))ks::activateWindow(originalForeground);
+    CoUninitialize();return result;
+}

tests/history_host.cpp

@@ -113,8 +113,8 @@ int main() {
         until([&]{history.reload();return history.entries().front().pinned;},"resident pin mutation");
         require(history.entries().front().id==textId,"pin preserves history identity");
         auto filter=[&](HWND window,int index) {
-            send(GetDlgItem(window,117),CB_SETCURSEL,index);
+            auto checkbox=GetDlgItem(window,117);
-            send(window,WM_COMMAND,MAKEWPARAM(117,CBN_SELCHANGE),LPARAM(GetDlgItem(window,117)));
+            if(send(checkbox,BM_GETCHECK)!=(index ? BST_CHECKED : BST_UNCHECKED)) send(checkbox,BM_CLICK);
         };
         filter(w,1);
         until([&]{return send(GetDlgItem(w,102),LB_GETCOUNT)==1;},"pinned filter hides unpinned entries");
@@ -129,7 +129,7 @@ int main() {
         send(w,WM_COMMAND,112);
         filter(w,1);
         close(w);w=open();
-        require(send(GetDlgItem(w,117),CB_GETCURSEL)==1,"pinned filter survives helper restart");
+        require(send(GetDlgItem(w,117),BM_GETCHECK)==BST_CHECKED,"pinned checkbox survives helper restart");
         wchar_t query[100]{};send(GetDlgItem(w,101),WM_GETTEXT,100,LPARAM(query));
         require(std::wstring(query)==L"History fixture 498","search survives helper restart");
         send(w,WM_COMMAND,114);

tests/input.cpp

@@ -2,6 +2,7 @@
 #include "ui_scroll.h"
 #include "ui_geometry.h"
 #include "screenshot.h"
+#include "ocr.h"
 #include <commctrl.h>
 #include <iostream>
 #include <cmath>
@@ -25,6 +26,17 @@ LRESULT CALLBACK countControlMoves(HWND w, UINT message, WPARAM wp, LPARAM lp, U
 }
 namespace ks {
 struct InputRegressionAccess {
+    static int snippetChoice(App &a, const std::vector<Snippet> &snippets) {
+        a.settings.snippets=snippets; a.settings.autoCorrect=false; a.busy=false;
+        a.snippetPending=-1; a.typingTarget=nullptr; a.snippetTyping=false;
+        auto target=GetForegroundWindow();
+        a.run.keys=L";si"; a.run.window=target; a.run.layout=windowLayout(target); a.run.at=GetTickCount64();
+        KBDLLHOOKSTRUCT key{};key.vkCode='G';key.scanCode=0x22;
+        a.keyboard(key,0);
+        int chosen=a.snippetPending;
+        a.busy=false;a.snippetPending=-1;a.typingTarget=nullptr;a.snippetTyping=false;
+        return chosen;
+    }
     static bool idleUndo(App &a) {
         a.last=LastTransform{}; a.last->at=100;
         a.releaseIdleMemory(120100);
@@ -94,6 +106,9 @@ struct InputRegressionAccess {
     }
     static void notificationSetup(App &a) { a.updateNotifier = notify; }
     static void setup(App &a) { a.hookBindings = {{Toggle,{MOD_CONTROL,VK_F12}}, {Case,{MOD_CONTROL|MOD_SHIFT,'U'}}}; }
+    static LRESULT routedKey(int code, UINT message, const KBDLLHOOKSTRUCT &key, LRESULT routed) {
+        return App::keyboardAfterHooks(code,message,(LPARAM)&key,routed);
+    }
     static bool updateTimer(App &a) {
         a.updateRunning=true; // Exercise timer scheduling without launching a network request.
         App::windowProc(a.window,WM_TIMER,5,0);
@@ -120,12 +135,25 @@ int main(int argc, char **argv) {
             return result.state == L"current" || result.state == L"available" ? 0 : 1;
         } catch (const std::exception &e) { std::cerr << e.what() << '\n'; return 1; }
     }
-    auto temp=std::filesystem::temp_directory_path()/(L"KSwitcher-input-tests-"+std::to_wstring(GetCurrentProcessId()));
+    auto temp=std::filesystem::temp_directory_path()/(L"KSwitcher-input-tests-"+ks::newSnippetId());
     int checks=0;
     auto require=[&](bool ok,const char* text) { if(!ok) throw std::runtime_error(text); ++checks; };
     try {
         INITCOMMONCONTROLSEX controls{sizeof(controls),ICC_STANDARD_CLASSES|ICC_LISTVIEW_CLASSES};
         InitCommonControlsEx(&controls);
+        {
+            ks::App app(GetModuleHandleW(nullptr),true,temp/L"snippet-scopes");
+            app.window=CreateWindowExW(0,L"STATIC",L"Snippet scope test",0,0,0,0,0,HWND_MESSAGE,nullptr,GetModuleHandleW(nullptr),nullptr);
+            auto process=ks::processName(GetForegroundWindow());
+            require(!process.empty(),"scope test has foreground process");
+            std::vector<ks::Snippet> snippets{{L";sig",L"global",L"global"},{L";sig",L"scoped",L"scoped",{process}}};
+            require(ks::InputRegressionAccess::snippetChoice(app,snippets)==1,"app-specific trigger wins even when global is first");
+            snippets[1].apps={L"kswitcher-no-such-process"};
+            require(ks::InputRegressionAccess::snippetChoice(app,snippets)==0,"unmatched app falls back to global snippet");
+            snippets.erase(snippets.begin());
+            require(ks::InputRegressionAccess::snippetChoice(app,snippets)==-1,"scoped snippet is not queued in another application");
+            DestroyWindow(app.window);app.window=nullptr;
+        }
         {
             HMENU menu = CreatePopupMenu(), child = CreatePopupMenu();
             AppendMenuW(menu,MF_STRING | MF_CHECKED,1,L"&Settings…");
@@ -648,6 +676,22 @@ int main(int argc, char **argv) {
             };
             auto commands=[&] { MSG m{}; int n=0; while(PeekMessageW(&m,app.window,WM_HOTKEY,WM_HOTKEY,PM_REMOVE)) ++n; return n; };
             auto f12=event(VK_F12);
+            {
+                const auto before = app.inputVersion.load();
+                const auto recorded = app.run.keys;
+                for (UINT message : {WM_KEYDOWN, WM_KEYUP, WM_SYSKEYDOWN, WM_SYSKEYUP})
+                    require(ks::InputRegressionAccess::routedKey(HC_ACTION,message,event('A',30),7)==7,
+                            "forwarded keyboard events preserve downstream suppression");
+                require(app.inputVersion==before && app.run.keys==recorded && commands()==0,
+                        "forwarded events never track text, invalidate transactions or dispatch shortcuts");
+                require(ks::InputRegressionAccess::routedKey(-1,WM_KEYDOWN,event('A',30),0)==0 &&
+                        app.inputVersion==before,"negative hook codes do not process keyboard input");
+                require(ks::InputRegressionAccess::routedKey(HC_ACTION,WM_KEYDOWN,event('A',30,true),0)==0 &&
+                        app.inputVersion==before,"own input remains excluded after downstream routing");
+                require(ks::InputRegressionAccess::routedKey(HC_ACTION,WM_KEYDOWN,event('A',30),0)==0 &&
+                        app.inputVersion>before,"delivered remote input is still processed on the receiver");
+                app.run.reset();
+            }
             require(!app.handleKeyboard(event(VK_LCONTROL),true,0),"remote modifier passes through");
             require(app.handleKeyboard(f12,true,MOD_CONTROL),"remote Ctrl+F12 handled");
             require(app.handleKeyboard(f12,true,MOD_CONTROL),"remote repeat suppressed");
@@ -881,7 +925,7 @@ int main(int argc, char **argv) {
                         "personal dictionary field fits options window");
             }
             SetDlgItemTextW(autoOptions,412,L"Релізик\r\nрелізик, словечко");
-            SetDlgItemTextW(autoOptions,416,L" Првиіт = Привіт\r\nhelo=hello");
+            SetDlgItemTextW(autoOptions,416,L" Првиіт = Привіт\r\nhelo=hello\r\n Мамамила = Мама мила ");
             SendDlgItemMessageW(autoOptions,414,BM_SETCHECK,BST_CHECKED,0);
             SendDlgItemMessageW(autoOptions,415,BM_SETCHECK,BST_CHECKED,0);
             SendMessageW(autoOptions,WM_COMMAND,IDOK,0);
@@ -903,7 +947,7 @@ int main(int argc, char **argv) {
                     "personal dictionary normalizes case, newlines and duplicate words");
             wchar_t pairs[128]{};
             GetDlgItemTextW(autoOptions,416,pairs,128);
-            require(std::wstring(pairs)==L"helo=hello\r\nпрвиіт=привіт\r\n" &&
+            require(std::wstring(pairs)==L"helo=hello\r\nмамамила=мама мила\r\nпрвиіт=привіт\r\n" &&
                     SendDlgItemMessageW(autoOptions,414,BM_GETCHECK,0,0)==BST_CHECKED &&
                     SendDlgItemMessageW(autoOptions,415,BM_GETCHECK,0,0)==BST_CHECKED,
                     "typo options and normalized replacement pairs survive reopening");
@@ -961,6 +1005,22 @@ int main(int argc, char **argv) {
                 require(pumpUntil(2),"history reloads after releasing hidden rows");
                 require(SendDlgItemMessageW(history,102,LB_GETCURSEL,0,0)==1,
                         "history retains selected record across close and reload");
+                SendMessageW(history,WM_CLOSE,0,0);
+                ks::Pixels screenshot{2,2,ks::Bytes(16,255)};
+                app.history->add(ks::Clip{{ks::imageDib(screenshot)}},L"screenshot",app.settings);
+                require(app.history->entries().front().image,"new screenshot is the newest history entry");
+                ks::showHistory(app);
+                require(pumpUntil(3),"reopening history loads the new screenshot");
+                require(SendDlgItemMessageW(history,102,LB_GETCURSEL,0,0)==0 &&
+                        SendDlgItemMessageW(history,102,LB_GETTOPINDEX,0,0)==0,
+                        "fresh history invocation selects and reveals newest screenshot instead of saved selection");
+                SendDlgItemMessageW(history,102,LB_SETCURSEL,2,0);
+                app.history->add(ks::textClip(L"background clipboard update"),L"test",app.settings);
+                ks::refreshHistory(app);
+                require(pumpUntil(4),"background refresh loads a new item");
+                require(SendDlgItemMessageW(history,102,LB_GETCURSEL,0,0)==3,
+                        "background refresh preserves the selected record while browsing");
+                ShowWindow(history,SW_HIDE);
             }
             auto childRect=[&](int id) { RECT r{}; GetWindowRect(GetDlgItem(history,id),&r); MapWindowPoints(nullptr,history,(POINT*)&r,2); return r; };
             RECT historyFrame{}; GetWindowRect(history,&historyFrame);
@@ -985,6 +1045,9 @@ int main(int argc, char **argv) {
             require(SendDlgItemMessageW(settings,209,BM_GETCHECK,0,0)==BST_UNCHECKED,"automatic screenshot editor checkbox defaults off");
             require(settings&&!IsWindowVisible(settings),"settings layout tested without changing user focus");
             for(auto pair:{std::pair{209,215},std::pair{209,207},std::pair{209,220},std::pair{209,232},std::pair{207,215},std::pair{207,232},std::pair{207,220},std::pair{232,230},std::pair{230,231},std::pair{231,253}}) {
+                // Controls on different settings tabs intentionally share the page area.
+                if (!(GetWindowLongPtrW(GetDlgItem(settings,pair.first),GWL_STYLE)&WS_VISIBLE) ||
+                    !(GetWindowLongPtrW(GetDlgItem(settings,pair.second),GWL_STYLE)&WS_VISIBLE)) continue;
                 RECT first{},second{},overlap{};
                 GetWindowRect(GetDlgItem(settings,pair.first),&first); GetWindowRect(GetDlgItem(settings,pair.second),&second);
                 require(!IntersectRect(&overlap,&first,&second),"capture hotkey and layout controls do not overlap");

tests/integration.cpp

@@ -33,6 +33,17 @@ bool trimCopiedSpaces = false;
 int trimmedCopies = 0;
 bool temporaryClipboardExcluded = true;
 bool clipboardAccessTimedOut = false;
+uint64_t forwardedVersion{};
+int forwardedEvents{};
+LRESULT CALLBACK forwardingHook(int code, WPARAM wp, LPARAM lp)
+{
+    if (code == HC_ACTION && reinterpret_cast<KBDLLHOOKSTRUCT *>(lp)->dwExtraInfo == 456)
+    {
+        ++forwardedEvents;
+        return 1; // Model MWB consuming source input routed to another machine.
+    }
+    return CallNextHookEx(nullptr, code, wp, lp);
+}
 LRESULT CALLBACK observeEnter(HWND w, UINT message, WPARAM wp, LPARAM lp, UINT_PTR, DWORD_PTR)
 {
     if (message == WM_KEYDOWN && wp == VK_LEFT && droppedSelectionKeys > 0 &&
@@ -577,10 +588,41 @@ LRESULT CALLBACK procedure(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                 require(ks::readClipboard(app->window).text() == sentinel, "selected and repeated conversions restore clipboard");
                 finish();
                 break;
+            case 62:
+                saved = ks::readClipboard(app->window, 64 * 1024 * 1024);
+                captured = true;
+                app->ownSequence = ks::writeClipboard(app->window, ks::textClip(sentinel));
+                app->settings.snippets = {{L";r", L"unexpected{enter}"}};
+                ActivateKeyboardLayout(app->layouts[en].handle, 0);
+                prepare(L"prefix ", false);
+                forwardedVersion = app->inputVersion.load();
+                copyRequests = forwardedEvents = 0;
+                {
+                    std::vector<INPUT> inputs;
+                    for (WORD key : {WORD(VK_OEM_1), WORD('R')})
+                        for (DWORD flags : {DWORD(0), DWORD(KEYEVENTF_KEYUP)})
+                        {
+                            auto input = ks::keyboardInput(key, flags);
+                            input.ki.dwExtraInfo = 456;
+                            inputs.push_back(input);
+                        }
+                    require(SendInput((UINT)inputs.size(),inputs.data(),sizeof(INPUT))==inputs.size(),
+                            "forwarded snippet input submitted to real hook chain");
+                }
+                break;
+            case 63:
+                require(forwardedEvents==4,"downstream forwarding hook consumed every key event");
+                require(app->inputVersion==forwardedVersion && copyRequests==0,
+                        "forwarded snippet does not start tracking or clipboard work on source computer");
+                require(text()==L"prefix " && ks::readClipboard(app->window).text()==sentinel,
+                        "forwarded snippet leaves source editor and clipboard untouched");
+                stage = 30;
+                break;
             case 30:
             case 32:
             case 34:
             case 37:
+            case 60:
                 // Earlier password/word tests replace the original multiline
                 // editor with a single-line EDIT. Restore the snippet fixture:
                 // a single-line control cannot insert the tested Enter action.
@@ -609,6 +651,11 @@ LRESULT CALLBACK procedure(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                 enterPresses = 0;
                 copyRequests = 0;
                 copyFailuresRemaining = stage == 38 ? 10 : stage == 33 ? 1 : 0;
+                if (stage == 61)
+                {
+                    pasteBehavior = 2; // Editor inserts unrelated clipboard text.
+                    app->settings.writeLog = false;
+                }
                 temporaryClipboardExcluded = true;
                 ActivateKeyboardLayout(app->layouts[en].handle, 0);
                 prepare(L"prefix ", false);
@@ -672,6 +719,13 @@ LRESULT CALLBACK procedure(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                 require(ks::readClipboard(app->window).text() == sentinel,
                         "exhausted copy retries restore the clipboard");
                 copyFailuresRemaining = 0;
+                stage = 60;
+                break;
+            case 61:
+                require(text() == L"prefix other! x", "incorrect snippet paste preserves following typing");
+                require(enterPresses == 0, "unverified snippet never submits Enter even without logging");
+                require(ks::readClipboard(app->window).text() == sentinel, "rejected snippet restores clipboard");
+                pasteBehavior = 0;
                 finish();
                 break;
             case 20:
@@ -748,14 +802,14 @@ LRESULT CALLBACK procedure(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             case 22:
                 require(text() == L"робить ", "automatic correction selects and converts the whole word across an internal comma");
                 app->settings.autoReplace = true;
-                app->settings.autoReplacements = {{L"helo", L"hello"}};
+                app->settings.autoReplacements = {{L"helo", L"hello world"}};
                 ActivateKeyboardLayout(app->layouts[en].handle, 0);
                 prepare(L"(Helo)! ", false);
                 record(L"(Helo)! ");
                 app->transform(ks::AutoCorrect);
                 break;
             case 23:
-                require(text() == L"(Hello)! ", "explicit typo pair replaces verified text with punctuation and capital");
+                require(text() == L"(Hello world)! ", "explicit phrase pair replaces verified text with punctuation and capital");
                 app->transform(ks::Undo);
                 break;
             case 24:
@@ -781,7 +835,7 @@ LRESULT CALLBACK procedure(HWND w, UINT msg, WPARAM wp, LPARAM lp)
             case 27:
                 require(text() == L"kswithcer ", "Undo suppresses the rejected spelling correction");
                 app->settings.autoReplace = true;
-                app->settings.autoReplacements = {{L"tehh", L"the"}};
+                app->settings.autoReplacements = {{L"tehh", L"the word"}};
                 app->autoPredictor.configure(L"dictionaries", app->settings.autoLanguages);
                 prepare(L"", false);
                 {
@@ -798,7 +852,7 @@ LRESULT CALLBACK procedure(HWND w, UINT msg, WPARAM wp, LPARAM lp)
                 }
                 break;
             case 28:
-                require(text() == L"the x", "custom replacement through keyboard hook preserves subsequent typing");
+                require(text() == L"the word x", "custom phrase replacement through keyboard hook preserves subsequent typing");
                 app->settings.autoReplace = false;
                 app->settings.autoTypos = false;
                 if (typosOnly) { finish(); break; }
@@ -985,9 +1039,12 @@ int main(int argc, char **argv)
             if (typosOnly || (argc > 1 && std::string(argv[1]) == "--typing-only"))
                 stage = 20;
             if (argc > 1 && std::string(argv[1]) == "--snippets-only")
-                stage = 30;
+                stage = 62;
             SetTimer(host, 1, 100, nullptr);
+            auto forwarding = SetWindowsHookExW(WH_KEYBOARD_LL,forwardingHook,GetModuleHandleW(nullptr),0);
+            require(forwarding!=nullptr,"downstream forwarding fixture installed before application hook");
             app->execute();
+            UnhookWindowsHookEx(forwarding);
         }
         std::filesystem::remove_all(root);
     }

tests/screenshot_ui.cpp

@@ -141,6 +141,38 @@ int main(int argc, char **argv)
             SendMessageW(window,WM_COMMAND,12,0); require(c.marks.empty(),"undo trapezoid creation");
             SendMessageW(window,WM_COMMAND,18,0); require(c.marks[0].shape==ks::ScreenshotShape::Trapezoid,"redo trapezoid creation");
             c.marks.clear(); c.selected=-1; c.history=ks::ScreenshotHistory{};
+            require(GetDlgItem(window,38)!=nullptr,"arc has a dedicated toolbar button");
+            SendMessageW(window,WM_KEYDOWN,'U',0);
+            require(c.shape==ks::ScreenshotShape::Arc && c.arrow && !c.freehand,"U selects arc tool");
+            mouse(WM_LBUTTONDOWN,{60,70}); mouse(WM_LBUTTONUP,{240,180});
+            require(c.marks.size()==1 && c.marks[0].shape==ks::ScreenshotShape::Arc && !c.marks[0].isHighlight(),
+                    "arc tool creates an editable shape");
+            auto arc=c.marks[0];
+            require(ks::hitScreenshotMark(arc,{150,70},3)==ks::MarkPart::Body &&
+                    ks::hitScreenshotMark(arc,{150,180},3)==ks::MarkPart::None,
+                    "arc selects its curve but has no closing chord");
+            ks::Surface rendered(320,240); PatBlt(rendered.dc,0,0,320,240,WHITENESS);
+            ks::drawMarks(rendered.dc,{arc});
+            require(GetPixel(rendered.dc,150,70)==arc.color && GetPixel(rendered.dc,150,180)==RGB(255,255,255),
+                    "arc renders an open curve without a closing chord");
+            auto exported=ks::decodeImage(ks::screenshotClip(c.image->dc,320,240,{arc}));
+            auto channel=[&](int x,int y,int component){return exported.bgra[(y*exported.width+x)*4+component];};
+            require(channel(150,70,2)==GetRValue(arc.color) && channel(150,70,1)==GetGValue(arc.color) &&
+                    channel(150,180,0)==255 && channel(150,180,1)==255 && channel(150,180,2)==255,
+                    "PNG export preserves the arc and its open chord");
+            mouse(WM_LBUTTONDOWN,arc.to); mouse(WM_LBUTTONUP,{260,200});
+            require(c.marks[0].to.x==260 && c.marks[0].points.back().y==200,"arc resizes with its bounds");
+            auto arcGrip=ks::screenshotShapeRotationHandle(arc);
+            auto turned=ks::dragScreenshotMark(arc,ks::MarkPart::Rotation,arcGrip,{280,135},320,240);
+            require(turned.rotation!=0 && ks::hitScreenshotMark(turned,ks::rotateShapePoint(turned,{150,70}),3)==ks::MarkPart::Body,
+                    "rotated arc remains selectable");
+            std::vector<ks::Mark> linked{arc}; ks::Mark connector{{10,10},{150,70},0};
+            ks::linkScreenshotEndpoint(connector,false,{150,70},linked,4);
+            require(connector.toLink.target!=0,"connector can attach to the arc curve");
+            SendMessageW(window,WM_COMMAND,12,0); require(c.marks[0].to.x==240,"undo arc resize");
+            SendMessageW(window,WM_COMMAND,12,0); require(c.marks.empty(),"undo arc creation");
+            SendMessageW(window,WM_COMMAND,18,0); require(c.marks[0].shape==ks::ScreenshotShape::Arc,"redo arc creation");
+            c.marks.clear(); c.selected=-1; c.history=ks::ScreenshotHistory{};
             SendMessageW(window,WM_COMMAND,21,0);
         }
         {

tests/stayhere.ps1

@@ -0,0 +1,29 @@
+param([Parameter(Mandatory=$true)][string]$Executable)
+$ErrorActionPreference='Stop'
+function Command([string]$Argument) {
+    $commandProcess=Start-Process -FilePath $Executable -ArgumentList $Argument -WindowStyle Hidden -PassThru
+    try {
+        $null=$commandProcess.Handle
+        $commandProcess.WaitForExit()
+        return $commandProcess.ExitCode
+    } finally { $commandProcess.Dispose() }
+}
+if ((Command '--status') -ne 3) { throw 'An isolated StayHere test instance is already running' }
+$process=Start-Process -FilePath $Executable -WindowStyle Hidden -PassThru
+$null=$process.Handle
+try {
+    $ready=$false
+    for($i=0;$i -lt 20;$i++) {
+        if((Command '--status') -eq 1){$ready=$true;break}
+        Start-Sleep -Milliseconds 50
+    }
+    if(!$ready){throw 'StayHere did not start enabled'}
+    if((Command '--pause') -ne 0 -or (Command '--status') -ne 2){throw 'StayHere pause failed'}
+    if((Command '--resume') -ne 0 -or (Command '--status') -ne 1){throw 'StayHere resume failed'}
+    if((Command '--exit') -ne 0 -or !$process.WaitForExit(3000)){throw 'StayHere exit failed'}
+    if((Command '--status') -ne 3){throw 'StayHere instance remained after exit'}
+    Write-Output 'Passed isolated StayHere start/status/pause/resume/exit checks'
+} finally {
+    if(!$process.HasExited){$null=Command '--exit';if(!$process.WaitForExit(3000)){$process.Kill()}}
+    $process.Dispose()
+}

tests/sync.cpp

@@ -70,6 +70,18 @@ int main()
         reordered.directIds = {L"00000422", L"00000409"}; reordered.direct = {L"Ctrl+2", L"Ctrl+1"};
         require(sharedSyncSettings(ordered) == sharedSyncSettings(reordered), "layout enumeration does not cause sync churn");
         auto j = parse(base);
+        {
+            Settings scoped = local;
+            scoped.snippets.push_back({L"test", L"Only Teams", L"teams-scope", {L"ms-teams"}});
+            auto wire=sharedSyncSettings(scoped);
+            require(restoreSyncSettings(wire, local, {}).snippets[1].apps==std::vector<std::wstring>{L"ms-teams"}, "sync preserves app scope");
+            auto leftScope=j,rightScope=j;
+            leftScope["snippets"].push_back({{"id","left-scope"},{"trigger","same"},{"text","left"},{"apps",Json::array({"notepad"})}});
+            rightScope["snippets"].push_back({{"id","right-scope"},{"trigger","same"},{"text","right"},{"apps",Json::array({"ms-teams"})}});
+            require(parse(mergeSyncSettings(base,bytes(leftScope),bytes(rightScope)))["snippets"].size()==3, "same trigger in different apps merges");
+            rightScope["snippets"].back()["apps"]=Json::array({"NOTEPAD.exe"});
+            rejects([&]{mergeSyncSettings(base,bytes(leftScope),bytes(rightScope));}, "sync detects overlapping application scopes");
+        }
         require(!j.contains("startWithSystem") && !j.contains("tesseractPath") && !j.contains("historyEnabled"), "local-only fields excluded");
         auto restored = restoreSyncSettings(base, local, {});
         require(restored.autostart && restored.elevatedAutostart && !restored.history && restored.tesseractPath == local.tesseractPath, "preserve device settings");

tests/tests.cpp

@@ -517,6 +517,24 @@ int main(int argc, char **argv)
         auto encoded = ks::encodeClip(clip);
         require(ks::decodeClip(encoded).text() == clip.text(), "clipboard Unicode roundtrip");
         require(ks::decodeClip(encoded).formats[1].name == L"HTML Format", "registered format identity");
+        auto selection = ks::textClip(L";pa");
+        selection.formats.push_back({0, L"vscode-editor-data", {1, 2, 3}});
+        auto relayed = selection;
+        relayed.formats.front().data.resize(128, 0xab);
+        std::reverse(relayed.formats.begin(), relayed.formats.end());
+        require(ks::selectionClipboardIdentity(selection) == ks::selectionClipboardIdentity(relayed),
+                "clipboard relay tolerates Unicode allocation slack and format order");
+        relayed.formats.front().data[0] ^= 1;
+        require(ks::selectionClipboardIdentity(selection) != ks::selectionClipboardIdentity(relayed),
+                "clipboard relay rejects changed editor metadata");
+        relayed = selection;
+        relayed.formats.pop_back();
+        require(ks::selectionClipboardIdentity(selection) != ks::selectionClipboardIdentity(relayed),
+                "clipboard relay rejects missing editor metadata");
+        relayed = selection;
+        relayed.formats.front() = ks::textClip(L";pb").formats.front();
+        require(ks::selectionClipboardIdentity(selection) != ks::selectionClipboardIdentity(relayed),
+                "clipboard relay rejects changed Unicode text");
         auto encrypted = ks::protect(encoded);
         require(encrypted != encoded, "history ciphertext differs");
         require(ks::unprotect(encrypted) == encoded, "Windows DPAPI roundtrip");
@@ -572,6 +590,12 @@ int main(int argc, char **argv)
             options.autoNever = {L"hlelo"};
             require(!edited.suggest(L"hlelo ", 0, layouts, options), "never-correct overrides explicit pairs");
             options.autoNever.clear();
+            options.autoReplacements[L"мамамила"] = L"мама мила";
+            correction = edited.suggest(L"(Мамамила)! ", 2, layouts, options);
+            require(correction && correction->text == L"(Мама мила)! " && correction->target == 2,
+                    "joined words split while preserving capitalization, punctuation and layout");
+            edited.reject(L"мамамила ", options);
+            require(!edited.suggest(L"мамамила ", 2, layouts, options), "undo suppresses phrase replacements");
             edited.reject(L"(Hlelo)! ", options);
             require(!edited.suggest(L"hlelo ", 0, layouts, options), "undo rejection suppresses custom replacements");
             options.autoReplace = false;
@@ -693,7 +717,7 @@ int main(int argc, char **argv)
         settings.elevatedAutostart = true;
         settings.autoCorrect = true;
         settings.autoReplace = settings.autoTypos = true;
-        settings.autoReplacements = {{L"првиіт", L"привіт"}, {L"helo", L"hello"}};
+        settings.autoReplacements = {{L"првиіт", L"привіт"}, {L"helo", L"hello"}, {L"мамамила", L"мама мила"}};
         settings.autoMaxRank = 10000;
         settings.autoMinLength = 5;
         settings.autoPrefixChars = L"(#";
@@ -708,7 +732,13 @@ int main(int argc, char **argv)
         require(restored.autoWords == settings.autoWords, "personal dictionaries survive settings roundtrip");
         require(restored.autoReplace && restored.autoTypos && restored.autoReplacements == settings.autoReplacements,
                 "typo options and Unicode pairs survive settings roundtrip");
-        for (const auto &pair : {std::pair{L"hello", L"привіт"}, {L"hello", L"hello"}, {L"hi!", L"hello"}})
+        for (const auto &pair : {std::pair{L"hello", L"привіт"}, {L"hello", L"hello"}, {L"hi!", L"hello"},
+                                {L"helloworld", L" hello world"}, {L"helloworld", L"hello world "},
+                                {L"helloworld", L"hello  world"}, {L"helloworld", L"hello\tworld"},
+                                {L"helloworld", L"hello\nworld"}, {L"hello world", L"helloworld"},
+                                {L"helloworld", L"hello світ"}, {L"helloworld", L"hello world!"},
+                                {L"helloworld", L"hello Hello"}, {L"helloworld", L""},
+                                {L"helloworld", L"abcdefghijklmnopqrstuvwxyz abcdef"}})
         {
             auto invalid = settings;
             invalid.autoReplacements = {{pair.first, pair.second}};

tests/update.ps1

@@ -50,6 +50,9 @@ try {
     foreach ($name in @('LICENSE','json-LICENSE.txt','README.md')) { [IO.File]::WriteAllText((Join-Path $source $name),'fixture') }
     [IO.Directory]::CreateDirectory((Join-Path $source 'dictionaries')) | Out-Null
     [IO.File]::WriteAllText((Join-Path $source 'dictionaries/en.txt'),'new dictionary')
+    [IO.Directory]::CreateDirectory((Join-Path $source 'tools')) | Out-Null
+    [IO.File]::WriteAllText((Join-Path $source 'tools/README.txt'),'portable utilities instructions')
+    [IO.File]::WriteAllText((Join-Path $source 'tools/StayHere.exe'),'bundled StayHere fixture')
     function Write-TestManifest($Folder) {
         $entries=@(Get-ChildItem -LiteralPath $Folder -File -Recurse | Where-Object Name -ne 'release-files.json' | ForEach-Object {
             @{path=$_.FullName.Substring($Folder.Length+1).Replace('\','/');size=$_.Length;sha256=(Get-FileHash -LiteralPath $_.FullName).Hash}
@@ -92,8 +95,18 @@ try {
     $null=$z.CreateEntry('undeclared.dll'); $z.Dispose()
     Reject { Expand-Release $extra (Join-Path $root 'extrastage') $binaryVersion } 'undeclared file rejected'
     $target=Join-Path $root 'install'; $backup=Join-Path $root 'backup'
+    $freshTarget=Join-Path $root 'fresh-install'
+    [IO.Directory]::CreateDirectory($freshTarget) | Out-Null
+    $freshChanges=[Collections.Generic.List[string]]::new()
+    $freshStage=Join-Path $root 'fresh-stage'
+    Copy-Item -LiteralPath $stage -Destination $freshStage -Recurse
+    Install-Files $freshStage $freshTarget (Join-Path $root 'fresh-backup') $freshChanges
+    Assert (Test-Path -LiteralPath (Join-Path $freshTarget 'tools/README.txt')) 'update creates portable tools folder'
     [IO.Directory]::CreateDirectory((Join-Path $target 'data')) | Out-Null
     [IO.Directory]::CreateDirectory((Join-Path $target 'dictionaries')) | Out-Null
+    [IO.Directory]::CreateDirectory((Join-Path $target 'tools')) | Out-Null
+    [IO.File]::WriteAllText((Join-Path $target 'tools/Personal.exe'),'personal utility fixture')
+    [IO.File]::WriteAllText((Join-Path $target 'tools/StayHere.exe'),'older StayHere fixture')
     [IO.File]::WriteAllText((Join-Path $target 'data/settings.json'),'personal settings')
     [IO.File]::WriteAllText((Join-Path $target 'dictionaries/en.txt'),'personal dictionary')
     [IO.File]::WriteAllText((Join-Path $target 'KSwitcher.exe'),'old binary fixture')
@@ -105,9 +118,14 @@ try {
     }
     Assert ([IO.File]::ReadAllText((Join-Path $target 'future-tool.exe')) -eq 'future companion fixture') 'new companion name installs without changing updater'
     Assert ([IO.File]::ReadAllText((Join-Path $target 'data/settings.json')) -eq 'personal settings') 'settings preserved'
+    Assert ([IO.File]::ReadAllText((Join-Path $target 'tools/Personal.exe')) -eq 'personal utility fixture') 'personal utilities preserved'
+    Assert ([IO.File]::ReadAllText((Join-Path $target 'tools/README.txt')) -eq 'portable utilities instructions') 'bundled tools documentation installed'
+    Assert ([IO.File]::ReadAllText((Join-Path $target 'tools/StayHere.exe')) -eq 'bundled StayHere fixture') 'bundled StayHere updated'
     Assert ([IO.File]::ReadAllText((Join-Path $target 'dictionaries/en.txt')) -eq 'personal dictionary') 'dictionary preserved'
     Undo-Files $target $backup $changed
     Assert ([IO.File]::ReadAllText((Join-Path $target 'KSwitcher.exe')) -eq 'old binary fixture') 'rollback restores original'
+    Assert ([IO.File]::ReadAllText((Join-Path $target 'tools/Personal.exe')) -eq 'personal utility fixture') 'rollback preserves personal utilities'
+    Assert ([IO.File]::ReadAllText((Join-Path $target 'tools/StayHere.exe')) -eq 'older StayHere fixture') 'rollback restores previous StayHere'
     Assert (!(Test-Path -LiteralPath (Join-Path $target 'README.md'))) 'rollback removes newly introduced files'
     Assert (!(Test-Path -LiteralPath (Join-Path $target 'KSwitcher.Config.exe'))) 'rollback removes newly introduced configurator'
     Assert (!(Test-Path -LiteralPath (Join-Path $target 'KSwitcher.Screenshot.exe'))) 'rollback removes newly introduced screenshot editor'

tests/utilities.cpp

@@ -0,0 +1,43 @@
+#include <windows.h>
+#include "../src/utilities.h"
+#include <fstream>
+#include <iostream>
+#include <stdexcept>
+
+int main()
+{
+    namespace fs = std::filesystem;
+    auto root = fs::temp_directory_path() / (L"KSwitcher-utilities-" + std::to_wstring(GetCurrentProcessId()));
+    try
+    {
+        std::error_code error;
+        if (!ks::discoverUtilities(root / L"missing", error).empty() || error)
+            throw std::runtime_error("Missing folder must be empty, not an error");
+        fs::create_directories(root / L"tools" / L"nested");
+        fs::create_directory(root / L"tools" / L"directory.exe");
+        for (auto name : {L"Zed.exe", L"alpha.EXE", L"A & B.exe", L"readme.txt", L"shortcut.lnk"})
+            std::ofstream(root / L"tools" / name).put('x');
+        std::ofstream(root / L"tools" / L"nested" / L"hidden.exe").put('x');
+        auto found = ks::discoverUtilities(root / L"tools", error);
+        if (error || found.size() != 3 || found[0].filename() != L"A & B.exe" ||
+            found[1].filename() != L"alpha.EXE" || found[2].filename() != L"Zed.exe")
+            throw std::runtime_error("Scan must filter direct executable files and sort names");
+        if (ks::utilityMenuLabel(found[0]) != L"A && B")
+            throw std::runtime_error("Ampersand must be displayed literally");
+        fs::remove(found[1]);
+        if (ks::discoverUtilities(root / L"tools", error).size() != 2)
+            throw std::runtime_error("Scan must refresh after a file is removed");
+        ks::discoverUtilities(root / L"tools" / L"readme.txt", error);
+        if (!error) throw std::runtime_error("Non-directory must report an error");
+        fs::remove_all(root);
+        std::cout << "Utilities regression tests passed\n";
+        return 0;
+    }
+    catch (const std::exception &e)
+    {
+        std::error_code ignored;
+        fs::remove_all(root, ignored);
+        std::cerr << e.what() << '\n';
+        return 1;
+    }
+}

utilities/StayHere/README.md

@@ -0,0 +1,31 @@
+# StayHere
+
+Маленька портативна утиліта для Windows, без .NET та інсталяції.
+
+Виберіть **Tools → StayHere** у меню трея (у v0.6.46 цей пункт називається Utilities)
+або запустіть `tools/StayHere.exe` поруч із KSwitcher.exe.
+Зелена крапка в треї означає, що підтримка активності ввімкнена.
+Клацання лівою кнопкою перемикає режим; правою — відкриває меню з перемикачем і виходом.
+Після кожного запуску режим увімкнений. Автозапуск не додається.
+
+Раз на 15 секунд перевіряється час бездіяльності. Після 3 хвилин без вводу
+надсилається натискання й відпускання F15. Поки ви працюєте, клавіші не надсилаються.
+Курсор миші не рухається. Увімкнений режим також утримує екран і систему від
+автоматичного сну. На заблокованому екрані та у відключеному сеансі активність
+не імітується. Ручне блокування Windows не обходиться.
+
+Механізм перенесено за поведінкою з Typlo. Він підтримує системну активність,
+але не керує статусом Teams через API: статус залежить також від Teams,
+календаря, інших пристроїв та політик організації. F15 може мати власне
+призначення в окремих програмах. На підвищених вікнах Windows може блокувати ввід;
+тоді підказка іконки показує помилку. Утиліта не запитує права адміністратора.
+
+## Збірка
+
+У репозиторії KSwitcher виконайте `./build.ps1 -Stage` з кореня проєкту.
+Утиліта збирається з `utilities/StayHere/main.cpp` у `build/staged/tools/StayHere.exe`
+і включається пакувальником у реліз. CMake також має ціль `StayHere`.
+Для запуску достатньо одного `StayHere.exe`; .NET не потрібний.
+
+CLI: `--pause`, `--resume`, `--exit` керують запущеним екземпляром.
+`--status` повертає код 1 для активного режиму, 2 для паузи, 3 якщо утиліта не запущена.

utilities/StayHere/main.cpp

@@ -0,0 +1,238 @@
+#include <windows.h>
+#include <shellapi.h>
+#include <wtsapi32.h>
+#include <cwchar>
+#include <initializer_list>
+#include <string>
+
+namespace {
+#ifdef STAYHERE_TEST_INSTANCE
+constexpr wchar_t ClassName[] = L"StayHere.Test.Tray.1";
+constexpr wchar_t MutexName[] = L"Local\\StayHere.Test.Tray.1";
+#else
+constexpr wchar_t ClassName[] = L"StayHere.Tray.1";
+constexpr wchar_t MutexName[] = L"Local\\StayHere.Tray.1";
+#endif
+constexpr UINT TrayMessage = WM_APP + 1;
+constexpr UINT ControlMessage = WM_APP + 2;
+constexpr UINT Toggle = 1, Quit = 2, Pause = 3, Resume = 4, Status = 5;
+constexpr DWORD IdleThreshold = 180000;
+bool enabled = true;
+bool sessionLocked = false;
+bool powerOk = true;
+bool inputOk = true;
+UINT taskbarCreated;
+HICON activeIcon, pausedIcon;
+NOTIFYICONDATAW tray{};
+
+constexpr bool shouldSignal(bool active, bool unlocked, DWORD now, DWORD lastInput) {
+    return active && unlocked && DWORD(now - lastInput) >= IdleThreshold;
+}
+static_assert(!shouldSignal(true, true, 179999, 0));
+static_assert(shouldSignal(true, true, 180000, 0));
+static_assert(!shouldSignal(false, true, 180000, 0));
+static_assert(!shouldSignal(true, false, 180000, 0));
+static_assert(shouldSignal(true, true, 179000, 0xfffffc18)); // tick counter wrap
+
+bool interactiveDesktop() {
+    if (sessionLocked) return false;
+    HDESK desktop = OpenInputDesktop(0, FALSE, DESKTOP_READOBJECTS);
+    if (!desktop) return false;
+    wchar_t name[128]{};
+    DWORD needed = 0;
+    bool ok = GetUserObjectInformationW(desktop, UOI_NAME, name, sizeof(name), &needed)
+        && _wcsicmp(name, L"Default") == 0;
+    CloseDesktop(desktop);
+    if (!ok) return false;
+    DWORD session;
+    LPWSTR buffer = nullptr;
+    DWORD bytes = 0;
+    if (!ProcessIdToSessionId(GetCurrentProcessId(), &session)) return false;
+    if (!WTSQuerySessionInformationW(WTS_CURRENT_SERVER_HANDLE, session, WTSConnectState, &buffer, &bytes)) return false;
+    ok = bytes >= sizeof(WTS_CONNECTSTATE_CLASS)
+        && *reinterpret_cast<WTS_CONNECTSTATE_CLASS*>(buffer) == WTSActive;
+    WTSFreeMemory(buffer);
+    return ok;
+}
+
+HICON makeIcon(COLORREF color) {
+    HDC screen = GetDC(nullptr);
+    HDC dc = CreateCompatibleDC(screen);
+    HBITMAP bitmap = CreateCompatibleBitmap(screen, 32, 32);
+    HGDIOBJ previous = SelectObject(dc, bitmap);
+    RECT rect{0, 0, 32, 32};
+    FillRect(dc, &rect, static_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
+    HBRUSH brush = CreateSolidBrush(color);
+    HGDIOBJ oldBrush = SelectObject(dc, brush);
+    HGDIOBJ oldPen = SelectObject(dc, GetStockObject(NULL_PEN));
+    Ellipse(dc, 3, 3, 29, 29);
+    SelectObject(dc, oldBrush);
+    SelectObject(dc, oldPen);
+    DeleteObject(brush);
+    SelectObject(dc, previous);
+    HBITMAP mask = CreateBitmap(32, 32, 1, 1, nullptr);
+    HGDIOBJ maskPrevious = SelectObject(dc, mask);
+    PatBlt(dc, 0, 0, 32, 32, WHITENESS);
+    oldBrush = SelectObject(dc, GetStockObject(BLACK_BRUSH));
+    oldPen = SelectObject(dc, GetStockObject(NULL_PEN));
+    Ellipse(dc, 3, 3, 29, 29);
+    SelectObject(dc, oldPen);
+    SelectObject(dc, oldBrush);
+    SelectObject(dc, maskPrevious);
+    ICONINFO info{TRUE, 0, 0, mask, bitmap};
+    HICON icon = CreateIconIndirect(&info);
+    DeleteObject(bitmap);
+    DeleteObject(mask);
+    DeleteDC(dc);
+    ReleaseDC(nullptr, screen);
+    return icon;
+}
+
+void updateTray() {
+    tray.hIcon = enabled ? activeIcon : pausedIcon;
+    const wchar_t* tip = !enabled ? L"StayHere — призупинено"
+        : !powerOk ? L"StayHere — помилка утримання від сну"
+        : !inputOk ? L"StayHere — не вдалося надіслати F15"
+        : L"StayHere — активно (F15 після 3 хв простою)";
+    lstrcpynW(tray.szTip, tip, ARRAYSIZE(tray.szTip));
+    Shell_NotifyIconW(NIM_MODIFY, &tray);
+}
+
+void setEnabled(bool value) {
+    enabled = value;
+    inputOk = true;
+    powerOk = SetThreadExecutionState(ES_CONTINUOUS |
+        (enabled && interactiveDesktop() ? ES_SYSTEM_REQUIRED | ES_DISPLAY_REQUIRED : 0)) != 0;
+    updateTray();
+}
+
+void tick() {
+    const bool unlocked = interactiveDesktop();
+    powerOk = SetThreadExecutionState(ES_CONTINUOUS |
+        (enabled && unlocked ? ES_SYSTEM_REQUIRED | ES_DISPLAY_REQUIRED : 0)) != 0;
+    LASTINPUTINFO idle{sizeof(idle), 0};
+    if (GetLastInputInfo(&idle) && shouldSignal(enabled, unlocked, GetTickCount(), idle.dwTime)) {
+        // Avoid inserting a key into a chord being held while the user is away.
+        for (int key : {VK_SHIFT, VK_CONTROL, VK_MENU, VK_LWIN, VK_RWIN,
+                        VK_LBUTTON, VK_RBUTTON, VK_MBUTTON}) {
+            if (GetAsyncKeyState(key) & 0x8000) return;
+        }
+        INPUT input[2]{};
+        input[0].type = input[1].type = INPUT_KEYBOARD;
+        input[0].ki.wVk = input[1].ki.wVk = VK_F15;
+        input[1].ki.dwFlags = KEYEVENTF_KEYUP;
+        inputOk = SendInput(2, input, sizeof(INPUT)) == 2;
+        if (!inputOk) { // If only key-down succeeded, make a best effort to release it.
+            SendInput(1, &input[1], sizeof(INPUT));
+        }
+    }
+    updateTray();
+}
+
+void showMenu(HWND window) {
+    HMENU menu = CreatePopupMenu();
+    AppendMenuW(menu, MF_STRING | (enabled ? MF_CHECKED : 0), Toggle, L"Підтримувати активність");
+    AppendMenuW(menu, MF_SEPARATOR, 0, nullptr);
+    AppendMenuW(menu, MF_STRING, Quit, L"Вийти");
+    POINT pos;
+    GetCursorPos(&pos);
+    SetForegroundWindow(window);
+    UINT command = TrackPopupMenu(menu, TPM_RETURNCMD | TPM_RIGHTBUTTON, pos.x, pos.y, 0, window, nullptr);
+    DestroyMenu(menu);
+    if (command) SendMessageW(window, ControlMessage, command, 0);
+    PostMessageW(window, WM_NULL, 0, 0);
+}
+
+LRESULT CALLBACK windowProc(HWND window, UINT message, WPARAM wp, LPARAM lp) {
+    if (message == taskbarCreated) {
+        Shell_NotifyIconW(NIM_ADD, &tray);
+        return 0;
+    }
+    switch (message) {
+    case TrayMessage:
+        if (lp == WM_RBUTTONUP || lp == WM_CONTEXTMENU) showMenu(window);
+        else if (lp == WM_LBUTTONUP) setEnabled(!enabled);
+        return 0;
+    case ControlMessage:
+        if (wp == Status) return enabled ? 1 : 2;
+        if (wp == Toggle) setEnabled(!enabled);
+        else if (wp == Pause) setEnabled(false);
+        else if (wp == Resume) setEnabled(true);
+        else if (wp == Quit) DestroyWindow(window);
+        return 0;
+    case WM_TIMER: tick(); return 0;
+    case WM_WTSSESSION_CHANGE:
+        if (wp == WTS_SESSION_LOCK || wp == WTS_REMOTE_DISCONNECT || wp == WTS_CONSOLE_DISCONNECT)
+            sessionLocked = true;
+        else if (wp == WTS_SESSION_UNLOCK || wp == WTS_REMOTE_CONNECT || wp == WTS_CONSOLE_CONNECT)
+            sessionLocked = false;
+        setEnabled(enabled);
+        return 0;
+    case WM_DESTROY:
+        KillTimer(window, 1);
+        WTSUnRegisterSessionNotification(window);
+        SetThreadExecutionState(ES_CONTINUOUS);
+        Shell_NotifyIconW(NIM_DELETE, &tray);
+        PostQuitMessage(0);
+        return 0;
+    }
+    return DefWindowProcW(window, message, wp, lp);
+}
+}
+
+int WINAPI wWinMain(HINSTANCE instance, HINSTANCE, PWSTR, int) {
+    int argc{};
+    auto argv=CommandLineToArgvW(GetCommandLineW(),&argc);
+    if(!argv)return 10;
+    const std::wstring argument=argc==2?argv[1]:L"";
+    LocalFree(argv);
+    if(argc>2)return 10;
+    const auto commandLine=argument.c_str();
+    UINT command = 0;
+    if (wcscmp(commandLine, L"--pause") == 0) command = Pause;
+    else if (wcscmp(commandLine, L"--resume") == 0) command = Resume;
+    else if (wcscmp(commandLine, L"--exit") == 0) command = Quit;
+    else if (wcscmp(commandLine, L"--status") == 0) command = Status;
+    else if (*commandLine) return 10;
+    HWND existing = FindWindowW(ClassName, nullptr);
+    if (command) {
+        if (!existing) return 3;
+        DWORD_PTR result = 0;
+        if (!SendMessageTimeoutW(existing, ControlMessage, command, 0, SMTO_ABORTIFHUNG, 2000, &result)) return 4;
+        return command == Status ? static_cast<int>(result) : 0;
+    }
+    HANDLE mutex = CreateMutexW(nullptr, FALSE, MutexName);
+    if (!mutex) return 5;
+    if (GetLastError() == ERROR_ALREADY_EXISTS) { CloseHandle(mutex); return 0; }
+    taskbarCreated = RegisterWindowMessageW(L"TaskbarCreated");
+    activeIcon = makeIcon(RGB(40, 185, 100));
+    pausedIcon = makeIcon(RGB(135, 140, 150));
+    WNDCLASSW wc{};
+    wc.lpfnWndProc = windowProc;
+    wc.hInstance = instance;
+    wc.lpszClassName = ClassName;
+    if (!RegisterClassW(&wc)) return 6;
+    HWND window = CreateWindowExW(0, ClassName, L"StayHere", WS_OVERLAPPED,
+        0, 0, 0, 0, nullptr, nullptr, instance, nullptr);
+    if (!window) return 7;
+    tray.cbSize = sizeof(tray);
+    tray.hWnd = window;
+    tray.uID = 1;
+    tray.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
+    tray.uCallbackMessage = TrayMessage;
+    tray.hIcon = activeIcon;
+    lstrcpyW(tray.szTip, L"StayHere");
+    if (!Shell_NotifyIconW(NIM_ADD, &tray)) { DestroyWindow(window); return 8; }
+    WTSRegisterSessionNotification(window, NOTIFY_FOR_THIS_SESSION);
+    setEnabled(true);
+    if (!SetTimer(window, 1, 15000, nullptr)) { DestroyWindow(window); return 9; }
+    MSG msg{};
+    while (GetMessageW(&msg, nullptr, 0, 0) > 0) {
+        TranslateMessage(&msg);
+        DispatchMessageW(&msg);
+    }
+    DestroyIcon(activeIcon);
+    DestroyIcon(pausedIcon);
+    CloseHandle(mutex);
+    return 0;
+}