Menu.prependSubmenu
void prependSubmenu(string label, gio.menu_model.MenuModel submenu)Convenience function for prepending a submenu menu item to the start of menu. Combine gio.menu_item.MenuItem.newSubmenu and gio.menu.Menu.insertItem for a more flexible alternative.
Parameters
label | the section label, or null |
submenu | a #GMenuModel with the items of the submenu |