Qt: Fix race condition when a game crashes immediately

Conflicts:
	src/platform/qt/Window.cpp

CHANGES

@@ -23,6 +23,7 @@ Bugfixes:
  - GBA Video: Fix sprite boundary conditions with mosaic
  - Video: Fix FFmpeg crashing when the file extension is wrong
  - GBA Audio: Fix GB audio channels being too quiet (fixes #159)
+ - Qt: Fix a race condition when a game crashes immediately
 Misc:
  - Qt: Disable sync to video by default
  - GBA: Exit cleanly on FATAL if the port supports it

src/platform/qt/Window.cpp

@@ -300,12 +300,19 @@ void Window::toggleFullScreen() {
 }
 
 void Window::gameStarted(GBAThread* context) {
+	char title[13] = { '\0' };
+	MutexLock(&context->stateMutex);
+	if (context->state < THREAD_EXITING) {
 		emit startDrawing(m_controller->drawContext(), context);
+		GBAGetGameTitle(context->gba, title);
+	} else {
+		MutexUnlock(&context->stateMutex);
+		return;
+	}
+	MutexUnlock(&context->stateMutex);
 	foreach (QAction* action, m_gameActions) {
 		action->setDisabled(false);
 	}
-	char title[13] = { '\0' };
-	GBAGetGameTitle(context->gba, title);
 	setWindowTitle(tr(PROJECT_NAME " - %1").arg(title));
 	attachWidget(m_display);
 	m_screenWidget->setScaledContents(true);