always show child indicator in shortcut tree

mainwindow.cpp

@@ -499,6 +499,7 @@ void MainWindow::setup_menus() {
 
 	QMenu* file_menu = menuBar->addMenu("&File");
 	connect(file_menu, SIGNAL(aboutToShow()), this, SLOT(fileMenu_About_To_Be_Shown()));
+	connect(file_menu, SIGNAL(aboutToHide()), this, SLOT(fileMenu_About_To_Hide()));
 
 	QMenu* new_menu = file_menu->addMenu("&New");
 	make_new_menu(new_menu);
@@ -1113,6 +1114,10 @@ void MainWindow::fileMenu_About_To_Be_Shown() {
 	}
 }
 
+void MainWindow::fileMenu_About_To_Hide() {
+	open_recent->clear();
+}
+
 void MainWindow::load_recent_project() {
 	int index = static_cast<QAction*>(sender())->data().toInt();
 	QString recent_url = recent_projects.at(index);