Fix mousewheeling on eventpane layers. r=tschaub (Closes #1438)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6556 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Handler/MouseWheel.js

@@ -104,7 +104,11 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
 
             if (!overLayerDiv) {
                 for(var i=0; i < this.map.layers.length; i++) {
-                    if (elem == this.map.layers[i].div) { 
+                    // Are we in the layer div? Note that we have two cases
+                    // here: one is to catch EventPane layers, which have a 
+                    // pane above the layer (layer.pane)
+                    if (elem == this.map.layers[i].div 
+                        || elem == this.map.layers[i].pane) { 
                         overLayerDiv = true;
                         break;
                     }