
Adds class PopupSubMenuMenuItem, which is an item holding a submenu, that is opened when the corresponding item is active, and is keyboard and mouse navigable like its Gtk counterpart. https://bugzilla.gnome.org/show_bug.cgi?id=623498
Adds class PopupSubMenuMenuItem, which is an item holding a submenu, that is opened when the corresponding item is active, and is keyboard and mouse navigable like its Gtk counterpart. https://bugzilla.gnome.org/show_bug.cgi?id=623498