don't waste coordinate space by using a smaller renderer extent and updating it on moveend. r=bartvde (closes #3359)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12163 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Vector.js

@@ -474,7 +474,7 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
         
         var ng = (OpenLayers.Renderer.NG && this.renderer instanceof OpenLayers.Renderer.NG);
         if (ng) {
-            zoomChanged && this.renderer.updateDimensions();
+            dragging || this.renderer.updateDimensions(zoomChanged);
         } else {
             var coordSysUnchanged = true;