M src/platform/qt/Window.cpp → src/platform/qt/Window.cpp

@@ -68,6 +68,7 @@ #endif
 	, m_mruMenu(nullptr)
 	, m_shortcutController(new ShortcutController(this))
 	, m_playerId(playerId)
+	, m_fullscreenOnStart(false)
 {
 	setFocusPolicy(Qt::StrongFocus);
 	setAcceptDrops(true);
@@ -469,6 +470,10 @@ QRect rect = frameGeometry();
 		rect.moveCenter(QApplication::desktop()->availableGeometry().center());
 		move(rect.topLeft());
 	}
+	if (m_fullscreenOnStart) {
+		enterFullScreen();
+		m_fullscreenOnStart = false;
+	}
 }
 
 void Window::closeEvent(QCloseEvent* event) {
@@ -518,6 +523,10 @@ toggleFullScreen();
 }
 
 void Window::enterFullScreen() {
+	if (!isVisible()) {
+		m_fullscreenOnStart = true;
+		return;
+	}
 	if (isFullScreen()) {
 		return;
 	}

M src/platform/qt/Window.h → src/platform/qt/Window.h

@@ -163,6 +163,7 @@ QList<QString> m_mruFiles;
 	QMenu* m_mruMenu;
 	ShortcutController* m_shortcutController;
 	int m_playerId;
+	bool m_fullscreenOnStart;
 
 	bool m_hitUnimplementedBiosCall;