Made the Feature handler more robust to things that are related to changing layer order on the map, by registering an event handler that will bring the handler's layer back to the top of the layer stack in the DOM. Contains a manual test. r=elemoine (closes #1628)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7879 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Handler/Feature.html

@@ -30,7 +30,7 @@
     }
 
     function test_Handler_Feature_activate(t) {
-        t.plan(4);
+        t.plan(3);
         var map = new OpenLayers.Map('map');
         var control = new OpenLayers.Control();
         map.addControl(control);
@@ -47,10 +47,8 @@
         activated = handler.activate();
         t.ok(activated,
              "activate returns true if the handler was not already active");
-        t.eq(handler.layerIndex, zIndex,
-             "layerIndex property properly set");
         t.eq(parseInt(layer.div.style.zIndex),
-             map.Z_INDEX_BASE['Popup'] - 1,
+             map.Z_INDEX_BASE['Feature'],
              "layer z-index properly adjusted");
         
     }
@@ -227,6 +225,8 @@
         map.addControl(control);
         var layer = new OpenLayers.Layer();
         map.addLayer(layer);
+        var layerIndex = parseInt(layer.div.style.zIndex);
+        
         var handler = new OpenLayers.Handler.Feature(control, layer);
         handler.active = false;
         var deactivated = handler.deactivate();
@@ -234,13 +234,12 @@
              "deactivate returns false if the handler was not already active");
         
         handler.active = true;
-        handler.layerIndex = Math.floor(Math.random() * 10);
 
         deactivated = handler.deactivate();
         t.ok(deactivated,
              "deactivate returns true if the handler was active already");
         t.eq(parseInt(layer.div.style.zIndex),
-             handler.layerIndex,
+             layerIndex,
              "deactivate sets the layer z-index back");
     }