add removeLayer() function to Layers... implement it for EventPane so that it removes the extra 'pane' div when the layer is removed. (Closes #887)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@4053 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/EventPane.js

@@ -104,6 +104,22 @@ OpenLayers.Layer.EventPane = OpenLayers.Class(OpenLayers.Layer, {
             this.loadWarningMessage();
         }
     },
+
+    /**
+     * APIMethod: removeMap
+     * On being removed from the map, we'll like to remove the invisible 'pane'
+     *     div that we added to it on creation. 
+     * 
+     * Parameters:
+     * map - {<OpenLayers.Map>}
+     */
+    removeMap: function(map) {
+        if (this.pane && this.pane.parentNode) {
+            this.pane.parentNode.removeChild(this.pane);
+            this.pane = null;
+        }
+        OpenLayers.Layer.prototype.removeMap.apply(this, arguments);
+    },
   
     /**
      * Method: loadWarningMessage