Cross-dateline rendering fixed for SVG and added for VML renderer.

lib/OpenLayers/Renderer.js

@@ -122,6 +122,11 @@ OpenLayers.Renderer = OpenLayers.Class({
      * Parameters:
      * extent - {<OpenLayers.Bounds>}
      * resolutionChanged - {Boolean}
+     *
+     * Returns:
+     * {Boolean} true to notify the layer that the new extent does not exceed
+     *     the coordinate range, and the features will not need to be redrawn.
+     *     False otherwise.
      */
     setExtent: function(extent, resolutionChanged) {
         this.extent = extent.clone();
@@ -131,6 +136,7 @@ OpenLayers.Renderer = OpenLayers.Class({
         if (resolutionChanged) {
             this.resolution = null;
         }
+        return true;
     },
     
     /**