close fullscreen when closing the app

mainwindow.cpp

@@ -981,6 +981,9 @@ void MainWindow::closeEvent(QCloseEvent *e) {
 
 		set_sequence(nullptr);
 
+		panel_footage_viewer->viewer_widget->close_window();
+		panel_sequence_viewer->viewer_widget->close_window();
+
 		panel_footage_viewer->set_main_sequence();
 
 		QString data_dir = get_data_path();

ui/viewerwidget.cpp

@@ -375,6 +375,10 @@ void ViewerWidget::mouseReleaseEvent(QMouseEvent *event) {
 	dragging = false;
 }
 
+void ViewerWidget::close_window() {
+	if (window != nullptr) window->hide();
+}
+
 void ViewerWidget::draw_waveform_func() {
 	QPainter p(this);
 	if (viewer->seq->using_workarea) {

ui/viewerwidget.h

@@ -29,6 +29,7 @@ public:
 	~ViewerWidget();
 
 	void delete_function();
+	void close_window();
 
 	void paintGL();
 	void initializeGL();