Warning
gtk_menu_item_remove_submenu has been deprecated since version 2.12 and should not be used in newly-written code. gtk_menu_item_remove_submenu() is deprecated and
should not be used in newly written code. Use
gtk_menu_item_set_submenu() instead.
Removes the widget's submenu.
Warning gtk_menu_item_remove_submenu has been deprecated since version 2.12 and should not be used in newly-written code. gtk_menu_item_remove_submenu() is deprecated and should not be used in newly written code. Use gtk_menu_item_set_submenu() instead. Removes the widget's submenu.