Release v0.6.9: notify about updates and fix Settings scroll flicker

src/app.cpp

@@ -233,6 +233,7 @@ class Transaction
 } // namespace
 App::App(HINSTANCE h, bool test, const std::filesystem::path &dataRoot) : instance(h), smoke(test)
 {
+    updateNotifier = notifyUpdateAvailable;
     current = this;
     data = dataRoot.empty() ? dataDirectory() : dataRoot;
     std::filesystem::create_directories(data);
@@ -674,6 +675,7 @@ void App::dispatch(int command)
         return;
     try
     {
+        if (command == 23) { checkUpdate(true); return; }
         if (command == Screenshot)
         {
             if (!busy) { resetInput(); launchScreenshot(*this); }
@@ -1328,6 +1330,8 @@ LRESULT CALLBACK App::windowProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
         if (app->updateWorker.joinable()) app->updateWorker.join();
         app->updateRunning = false;
         app->installingUpdate = false;
+        log(L"Update check: " + result->state + (result->version.empty() ? L"" : L" " + result->version) +
+            (result->error.empty() ? L"" : L"; " + result->error));
         if (result->state == L"prepared")
         {
             // The helper has verified and staged the package; it waits for process exit.
@@ -1345,13 +1349,16 @@ LRESULT CALLBACK App::windowProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
             }
             else if (app->notifiedUpdate != result->version)
             {
-                app->notifiedUpdate = result->version;
-                NOTIFYICONDATAW icon{sizeof(icon)};
-                icon.hWnd = hwnd; icon.uID = 1; icon.uFlags = NIF_INFO; icon.dwInfoFlags = NIIF_INFO;
-                wcscpy_s(icon.szInfoTitle, L"KSwitcher update available");
-                auto text = result->version + L" is available. Select Update in the tray menu to install.";
-                wcsncpy_s(icon.szInfo, text.c_str(), _TRUNCATE);
-                Shell_NotifyIconW(NIM_MODIFY, &icon);
+                if (app->updateNotifier(result->version))
+                {
+                    app->notifiedUpdate = result->version;
+                    log(L"Update notification submitted to Windows: " + result->version);
+                }
+                else
+                {
+                    log(L"Update notification failed; retrying in 5 minutes: " + result->version);
+                    SetTimer(hwnd, 5, UpdateNotificationRetryMs, nullptr);
+                }
             }
         }
         else if (result->state == L"current")