attempt to reduce flicker by override EVT_ERASE_BACKGROUND

src/gui/about_window.cpp

@@ -152,6 +152,7 @@ BEGIN_EVENT_TABLE(HoverButtonBase, wxControl)
 	EVT_KEY_DOWN       (HoverButtonBase::onKeyDown)
 	EVT_KEY_UP         (HoverButtonBase::onKeyUp)
 	EVT_MOUSE_CAPTURE_LOST(HoverButtonBase::onLoseCapture)
+	EVT_ERASE_BACKGROUND(HoverButtonBase::onEraseBackground)
 END_EVENT_TABLE  ()
 
 // ----------------------------------------------------------------------------- : Button with image and hover effect

src/gui/about_window.hpp

@@ -54,6 +54,7 @@ class HoverButtonBase : public wxControl {
 	void onKeyDown   (wxKeyEvent&);
 	void onKeyUp     (wxKeyEvent&);
 	void onPaint     (wxPaintEvent&);
+	void onEraseBackground(wxEraseEvent&) {}
 	
   protected:
 	bool hover, focus, mouse_down, key_down;

src/gui/welcome_window.cpp

@@ -144,6 +144,7 @@ BEGIN_EVENT_TABLE(WelcomeWindow, wxFrame)
 	EVT_BUTTON         (ID_FILE_RECENT,        WelcomeWindow::onOpenLast)
 	EVT_BUTTON         (ID_FILE_CHECK_UPDATES, WelcomeWindow::onCheckUpdates)
 	EVT_PAINT          (                       WelcomeWindow::onPaint)
+	EVT_ERASE_BACKGROUND(WelcomeWindow::onEraseBackground)
 //	EVT_IDLE           (                       WelcomeWindow::onIdle)
 END_EVENT_TABLE  ()
 

src/gui/welcome_window.hpp

@@ -41,6 +41,7 @@ class WelcomeWindow : public Frame {
 	void onNewSet      (wxCommandEvent&);
 	void onOpenLast    (wxCommandEvent&);
 	void onCheckUpdates(wxCommandEvent&);
+	void onEraseBackground(wxEraseEvent&) {}
 //	void onIdle    (wxIdleEvent& ev);
 	
 	/// Close the welcome window, and show the given set