If label is non-null it is used to set the "label" attribute of the
new item.
If detailed_action is non-null it is used to set the "action" and
possibly the "target" attribute of the new item. See
gio.menu_item.MenuItem.setDetailedAction for more information.
Creates a new #GMenuItem.
If label is non-null it is used to set the "label" attribute of the new item.
If detailed_action is non-null it is used to set the "action" and possibly the "target" attribute of the new item. See gio.menu_item.MenuItem.setDetailedAction for more information.