Whether this activatable should reset its layout and appearance when setting the related action or when the action changes appearance.
See the #GtkAction documentation directly to find which properties should be ignored by the #GtkActivatable when this property is %FALSE.
#GtkActivatable implementors need to handle this property and call gtk_activatable_sync_action_properties() on the activatable widget when it changes.
The action that this activatable will activate and receive updates from for various states and possibly appearance.