Qt: Fix Wayland support

src/panda_qt/main.cpp

@@ -7,6 +7,5 @@ int main(int argc, char *argv[]) {
 	QApplication app(argc, argv);
 	MainWindow window(&app);
 
-	window.show();
 	return app.exec();
 }

src/panda_qt/main_window.cpp

@@ -22,14 +22,13 @@ MainWindow::MainWindow(QApplication* app, QWidget* parent) : QMainWindow(parent)
 	// Enable drop events for loading ROMs
 	setAcceptDrops(true);
 	resize(800, 240 * 4);
+	show();
 
 	// We pass a callback to the screen widget that will be triggered every time we resize the screen
 	screen = new ScreenWidget([this](u32 width, u32 height) { handleScreenResize(width, height); }, this);
 	setCentralWidget(screen);
 
-	screen->show();
 	appRunning = true;
-
 	// Set our menu bar up
 	menuBar = new QMenuBar(nullptr);
 
@@ -699,4 +698,4 @@ void MainWindow::setupControllerSensors(SDL_GameController* controller) {
 	if (haveAccelerometer) {
 		SDL_GameControllerSetSensorEnabled(controller, SDL_SENSOR_ACCEL, SDL_TRUE);
 	}
-}
+}

src/panda_qt/screen.cpp

@@ -29,6 +29,7 @@ ScreenWidget::ScreenWidget(ResizeCallback resizeCallback, QWidget* parent) : QWi
 	setAttribute(Qt::WA_KeyCompression, false);
 	setFocusPolicy(Qt::StrongFocus);
 	setMouseTracking(true);
+	show();
 
 	if (!createGLContext()) {
 		Helpers::panic("Failed to create GL context for display");
@@ -84,7 +85,7 @@ bool ScreenWidget::createGLContext() {
 }
 
 qreal ScreenWidget::devicePixelRatioFromScreen() const {
-	const QScreen* screenForRatio = window()->windowHandle()->screen();
+	const QScreen* screenForRatio = windowHandle()->screen();
 	if (!screenForRatio) {
 		screenForRatio = QGuiApplication::primaryScreen();
 	}