Qt editor: Fix freeze during lobby and loading on Linux

src/game/C4Game.cpp

@@ -3350,6 +3350,9 @@ void C4Game::SetInitProgress(float fToProgress)
 	}
 	// Cheap hack to get the Console window updated while loading
 	Application.FlushMessages();
+#ifdef WITH_QT_EDITOR
+	Application.ProcessQtEvents();
+#endif
 }
 
 void C4Game::OnResolutionChanged(unsigned int iXRes, unsigned int iYRes)

src/platform/C4App.cpp

@@ -62,10 +62,24 @@ bool C4AbstractApp::DoScheduleProcs(int iTimeout)
 #if defined(USE_SDL_MAINLOOP) || defined(USE_COCOA)
 	// Unfortunately, the SDL event loop needs to be polled
 	FlushMessages();
+#endif
+#ifdef WITH_QT_EDITOR
+	// Some places, for example the lobby, have a nested event processing loop.
+	// To prevent the editor from freezing, call the Qt event loop here.
+	if (iTimeout)
+		ProcessQtEvents();
 #endif
 	return StdScheduler::DoScheduleProcs(iTimeout);
 }
 
+#ifdef WITH_QT_EDITOR
+void C4AbstractApp::ProcessQtEvents()
+{
+	if (Application.isEditor)
+		QApplication::processEvents();
+}
+#endif
+
 void C4Window::PerformUpdate()
 {
 }

src/platform/C4App.h

@@ -71,6 +71,9 @@ public:
 
 	virtual bool DoScheduleProcs(int iTimeout);
 	bool FlushMessages();
+#ifdef WITH_QT_EDITOR
+	void ProcessQtEvents();
+#endif
 	C4Window * pWindow;
 	bool fQuitMsgReceived; // if true, a quit message has been received and the application should terminate