group into this.
Children of this that implement [iface@Gtk.Actionable] can then be associated with actions in
by setting their “action-name” to
Note that inheritance is defined for individual actions. I.e. even if you insert a group with prefix
prefix, actions with the same
prefix will still be inherited from the parent, unless the group contains an action with the same name.
group is null, a previously inserted group for
name is removed from
the prefix for actions in
a `GActionGroup`, or null to remove the previously inserted group for