Release v0.6.37: isolate image capture and OCR, fingerprint history duplicates

tests/ocr.cpp

@@ -59,6 +59,24 @@ int main(int argc, char **argv)
             app.settings.history = true;
             app.history->add(clip, L"OCR fixture", app.settings);
             auto id = app.history->entries().front().id;
+            auto isolated = app.history->recognizeImage(id, config);
+            if (isolated != text) throw std::runtime_error("Helper and in-process OCR results differ");
+            bool cancelled = false;
+            try { app.history->recognizeImage(id, config, [] { return true; }); }
+            catch (const std::exception &) { cancelled = true; }
+            if (!cancelled) throw std::runtime_error("Cancelled OCR request was executed");
+            auto invalid = config;
+            invalid.useTesseract = true;
+            invalid.tesseractPath = (temp / L"missing-tesseract.exe").wstring();
+            bool failed = false;
+            try { app.history->recognizeImage(id, invalid); }
+            catch (const std::exception &) { failed = true; }
+            if (!failed || app.history->entries().front().ocrState != 1)
+                throw std::runtime_error("Failed helper modified history metadata");
+            for (const auto &file : std::filesystem::directory_iterator(temp / L"history"))
+                if (file.path().filename().wstring().starts_with(L"ocr-"))
+                    throw std::runtime_error("OCR helper left temporary files");
+            std::cout << "PASS isolated OCR equivalence, cancellation, failure and encrypted IPC cleanup\n";
             if (tesseract)
             {
                 app.history->saveOcr(id, L"old Windows result", app.settings);