Refresh window before taking a screenshot

src/util/screenshot.cpp

@@ -315,6 +315,8 @@ bool Screenshot::SaveScreenshotOfTextWindow(const wxString& filePath,
             { return false; }
         }
 
+    PrepareWindowForScreenshot(windowToCapture);
+
     if (highlightPoints.size())
         { dynamic_cast<wxTextCtrl*>(windowToCapture)->ShowPosition(highlightPoints[0].first); }
 
@@ -405,6 +407,8 @@ bool Screenshot::SaveScreenshotOfPropertyGrid(const wxString& filePath,
     if (windowToCapture == nullptr)
         { return false; }
 
+    PrepareWindowForScreenshot(windowToCapture);
+
     wxClientDC dc(windowToCapture);
     wxMemoryDC memDC;
 
@@ -483,6 +487,8 @@ bool Screenshot::SaveScreenshot(const wxString& filePath,
     if (windowToCapture == nullptr)
         { return false; }
 
+    PrepareWindowForScreenshot(windowToCapture);
+
     wxClientDC dc(windowToCapture);
     wxMemoryDC memDC;
 
@@ -566,6 +572,15 @@ bool Screenshot::SaveScreenshot(const wxString& filePath,
     return bitmap.SaveFile(fn.GetFullPath(), wxBITMAP_TYPE_BMP);
     }
 
+//---------------------------------------------------
+void Screenshot::PrepareWindowForScreenshot(wxWindow* windowToCapture)
+    {
+    windowToCapture->Refresh(true);
+    windowToCapture->UpdateWindowUI(wxUPDATE_UI_RECURSE);
+    wxTheApp->Yield();
+    ::wxSleep(1);
+    }
+
 //---------------------------------------------------
 wxWindow* Screenshot::GetActiveDialogOrFrame()
     {

src/util/screenshot.h

@@ -104,7 +104,7 @@ class Screenshot
         @returns @c true if the image was successfully converted and saved.*/
     static bool ConvertImageToPng(const wxString& filePath, const wxSize scaledSize,
         const bool removeOriginalFile = false);
-private:
+
     /// @returns The active dialog or frame.
     /// @note @c wxGetActiveWindow() always returns null on macOS, so this
     ///     uses @c wxWindow::FindFocus() and moves up to the parent dialog or frame.
@@ -114,7 +114,10 @@ class Screenshot
     ///     to get the app's main window.
     [[nodiscard]]
     static wxWindow* GetActiveDialogOrFrame();
-
+private:
+    /// @brief Ensures that everything is repainted and ready for screenshot.
+    /// @param windowToCapture The window to prepare for the screenshot.
+    static void PrepareWindowForScreenshot(wxWindow* windowToCapture);
     static void AddBorderToImage(wxBitmap& bmp);
 
     static wxPen GetScreenshotHighlightPen(const int width)