Creates a #GMenuItem as an exact copy of an existing menu item in a #GMenuModel.
item_index must be valid (ie: be sure to call gio.menu_model.MenuModel.getNItems first).
a #GMenuModel
the index of an item in model
a new #GMenuItem.
Creates a #GMenuItem as an exact copy of an existing menu item in a #GMenuModel.
item_index must be valid (ie: be sure to call gio.menu_model.MenuModel.getNItems first).