Children of @widget that implement [iface@Gtk.Actionable] can
then be associated with actions in @group by setting their
“action-name” to @prefix.action-name.
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.
If @group is %NULL, a previously inserted group for @name is
removed from @widget.
Inserts @group into @widget.
Children of @widget that implement [iface@Gtk.Actionable] can then be associated with actions in @group by setting their “action-name” to @prefix.action-name.
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.
If @group is %NULL, a previously inserted group for @name is removed from @widget.