Qt: Fix window not regaining focus after exiting savestate window

CHANGES

@@ -13,6 +13,7 @@ Bugfixes:
  - ARM7: Fix SWI and IRQ timings
  - GBA Audio: Force audio FIFOs to 32-bit
  - GBA Memory: Ensure changing the timing of a DMA reschedules it
+ - Qt: Fix window not regaining focus after exiting savestate window
 
 0.2.0: (2015-04-03)
 Features:

src/platform/qt/Window.cpp

@@ -542,7 +542,7 @@ void Window::openStateWindow(LoadSave ls) {
 	connect(m_stateWindow, &LoadSaveState::closed, [this]() {
 		m_screenWidget->layout()->removeWidget(m_stateWindow);
 		m_stateWindow = nullptr;
-		setFocus();
+		QMetaObject::invokeMethod(this, "setFocus", Qt::QueuedConnection);
 	});
 	if (!wasPaused) {
 		m_controller->setPaused(true);