Gtk.UIManager.prototype.insert_action_group
function insert_action_group(action_group:Gtk.ActionGroup, pos:Number):void {
    // Gjs wrapper for gtk_ui_manager_insert_action_group()
}Inserts an action group into the list of action groups associated with manager. Actions in earlier groups hide actions with the same name in later groups.
If pos is larger than the number of action groups in manager, or negative, action_group will be inserted at the end of the internal list.
Since 2.4
- action_group
 the action group to be inserted
- pos
 the position at which the group will be inserted.