Sets the related action on the @activatable object.
> #GtkActivatable implementors need to handle the #GtkActivatable:related-action > property and call gtk_activatable_do_set_related_action() when it changes.
the #GtkAction to set
2.16
See Implementation
Sets the related action on the @activatable object.
> #GtkActivatable implementors need to handle the #GtkActivatable:related-action > property and call gtk_activatable_do_set_related_action() when it changes.