BBOX strategy register for layer visibilitychanged, r=tschaub (closes #1835)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9195 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer.js

@@ -458,7 +458,10 @@ OpenLayers.Layer = OpenLayers.Class({
             var extent = this.getExtent();
 
             if (extent && this.inRange && this.visibility) {
-                this.moveTo(extent, true, false);
+                var zoomChanged = true;
+                this.moveTo(extent, zoomChanged, false);
+                this.events.triggerEvent("moveend",
+                    {"zoomChanged": zoomChanged});
                 redrawn = true;
             }
         }