Sets or unsets the "submenu" link of menu_item to submenu.
If submenu is non-NULL, it is linked to. If it is NULL then the link is unset.
The effect of having one menu appear as a submenu of another is exactly as it sounds.
a gio.MenuModel, or NULL
2.32
Sets or unsets the "submenu" link of menu_item to submenu.
If submenu is non-NULL, it is linked to. If it is NULL then the link is unset.
The effect of having one menu appear as a submenu of another is exactly as it sounds.