windowMenu: Ping window when activating any menu action

We do this for actions in the regular app menu, it makes sense to
do the same for window menu and fallback app menu.

js/ui/windowMenu.js

@@ -155,6 +155,10 @@ const WindowMenuManager = new Lang.Class({
 
         this._manager.addMenu(menu);
 
+        menu.connect('activate', function() {
+            window.check_alive(global.get_current_time());
+        });
+
         Main.layoutManager.setDummyCursorGeometry(x, y, 0, 0);
         menu.open(BoxPointer.PopupAnimation.NONE);
         menu.actor.navigate_focus(null, Gtk.DirectionType.TAB_FORWARD, false);