fall back to Element.getDimensions when the element has no size (such as when it's hidden).

git-svn-id: http://svn.openlayers.org/trunk/openlayers@117 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -167,8 +167,16 @@ OpenLayers.Map.prototype = {
     */
     getSize: function () {
         // should this be cached?
-        return new OpenLayers.Size(
+        var size = new OpenLayers.Size(
                     this.div.clientWidth, this.div.clientHeight);
+        
+        // Workaround for the fact that hidden elements return 0 for size.
+        if (size.w == 0 && size.h == 0) {
+           var elementSize = Element.getDimensions(this.div);
+           size.w = elementSize.width; 
+           size.h = elementSize.height; 
+        }
+        return size;
     },
 
     /**