Fix actiongroup-action interaction that relied on actions connecting to

Fix actiongroup-action interaction that relied on actions connecting to

2006-01-07  Matthias Clasen  <mclasen@redhat.com>

	Fix actiongroup-action interaction that relied on
	actions connecting to notify on themselves:

	* gtk/gtkaction.[hc]: Factor out the code updating the
	visibility/sensitivity of proxies into _gtk_action_sync_visible()
	and _gtk_action_sync_sensible().

	* gtk/gtkactiongroup.c: Call the new functions when the
	group visibility/sensitivity changes.