removeLayer must reset layers z-index. Thanks tschaub for the review and the new patch. (closes #1090)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5386 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -632,6 +632,17 @@ OpenLayers.Map = OpenLayers.Class({
             + zIdx * 5 );
     },
 
+    /**
+     * Method: resetLayersZIndex
+     * Reset each layer's z-index based on layer's array index
+     */
+    resetLayersZIndex: function() {
+        for (var i = 0; i < this.layers.length; i++) {
+            var layer = this.layers[i];
+            this.setLayerZIndex(layer, i);
+        }
+    },
+
     /**
     * APIMethod: addLayer
     *
@@ -740,6 +751,9 @@ OpenLayers.Map = OpenLayers.Class({
                 }
             }
         }
+
+        this.resetLayersZIndex();
+
         this.events.triggerEvent("removelayer");
     },