switch order of superclass.clone() (as in r901). then make sure that tileSize gets copied using copyOf(), and that the reference to the old grid does not get carried over.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@902 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -64,11 +64,18 @@ OpenLayers.Layer.Grid.prototype =
                                             this.options);
         }
 
-        // copy/set any non-init, non-simple values here
-        obj.tileSize = this.tileSize.copyOf();
-        
         //get all additions from superclasses
-        return OpenLayers.Layer.HTTPRequest.prototype.clone.apply(this, [obj]);
+        obj = OpenLayers.Layer.HTTPRequest.prototype.clone.apply(this, [obj]);
+
+        // copy/set any non-init, non-simple values here
+        if (this.tileSize != null) {
+            obj.tileSize = this.tileSize.copyOf();
+        }
+        
+        // we do not want to copy reference to grid. that should stay at null
+        obj.grid = null;
+
+        return obj;
     },    
 
     /** When the layer is added to a map, then we can ask the map for