always show child indicator in shortcut tree

dialogs/preferencesdialog.cpp

@@ -57,6 +57,7 @@ void PreferencesDialog::setup_kbd_shortcut_worker(QMenu* menu, QTreeWidgetItem*
 			parent->addChild(item);
 
 			if (a->menu() != NULL) {
+				item->setChildIndicatorPolicy(QTreeWidgetItem::ShowIndicator);
 				setup_kbd_shortcut_worker(a->menu(), item);
 			} else {
 				item->setData(0, Qt::UserRole + 1, reinterpret_cast<quintptr>(a));

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);

mainwindow.h

@@ -71,6 +71,7 @@ private slots:
 	void zoom_out_tracks();
 
 	void fileMenu_About_To_Be_Shown();
+	void fileMenu_About_To_Hide();
 	void editMenu_About_To_Be_Shown();
 	void windowMenu_About_To_Be_Shown();
 	void viewMenu_About_To_Be_Shown();