Added ability to check if menu has no items.

ui/widgets/dropdown_menu.cpp

@@ -72,6 +72,10 @@ const std::vector<not_null<QAction*>> &DropdownMenu::actions() const {
 	return _menu->actions();
 }
 
+bool DropdownMenu::empty() const {
+	return _menu->empty();
+}
+
 void DropdownMenu::handleActivated(const Menu::CallbackData &data) {
 	if (data.source == TriggeredSource::Mouse) {
 		if (!popupSubmenuFromAction(data)) {

ui/widgets/dropdown_menu.h

@@ -27,6 +27,7 @@ public:
 	}
 
 	const std::vector<not_null<QAction*>> &actions() const;
+	bool empty() const;
 
 	~DropdownMenu();
 

ui/widgets/menu/menu.cpp

@@ -159,6 +159,10 @@ void Menu::clearActions() {
 void Menu::finishAnimating() {
 }
 
+bool Menu::empty() const {
+	return _actionWidgets.empty();
+}
+
 void Menu::setShowSource(TriggeredSource source) {
 	_mouseSelection = (source == TriggeredSource::Mouse);
 	setSelected((source == TriggeredSource::Mouse || _actions.empty()) ? -1 : 0);

ui/widgets/menu/menu.h

@@ -31,6 +31,8 @@ public:
 	void clearActions();
 	void finishAnimating();
 
+	bool empty() const;
+
 	void clearSelection();
 
 	void setChildShown(bool shown) {

ui/widgets/popup_menu.cpp

@@ -118,6 +118,10 @@ const std::vector<not_null<QAction*>> &PopupMenu::actions() const {
 	return _menu->actions();
 }
 
+bool PopupMenu::empty() const {
+	return _menu->empty();
+}
+
 void PopupMenu::paintEvent(QPaintEvent *e) {
 	QPainter p(this);
 

ui/widgets/popup_menu.h

@@ -27,6 +27,7 @@ public:
 	void clearActions();
 
 	const std::vector<not_null<QAction*>> &actions() const;
+	bool empty() const;
 
 	void deleteOnHide(bool del);
 	void popup(const QPoint &p);