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GtkActivatable implementors.gtkActivatableDoSetRelatedAction(object, action)objectactionGtkAction to setGtkActivatable you must call this when
handling changes of the "related-action", and
you must also use this to break references in GObject->dispose().
This function adds a reference to the currently set related
action for you, it also makes sure the GtkActivatable->update()
method is called when the related GtkAction properties change
and registers to the action's proxy list.
PLEASE NOTE: Be careful to call this before setting the local
copy of the GtkAction property, since this function uses
gtkActivatableGetAction() to retrieve the previous action Since 2.16