Merge pull request #1372 from elemoine/vector-api-layer-group

[vector-api] Fix forEachFeatureAtPixel bug

src/ol/renderer/maprenderer.js

@@ -95,9 +95,7 @@ ol.renderer.Map.prototype.forEachFeatureAtPixel =
     function(pixel, callback, opt_obj, opt_layerFunction, opt_obj2) {
   var layerFunction = goog.isDef(opt_layerFunction) ?
       opt_layerFunction : goog.functions.TRUE;
-  var layers = this.map_.getLayers();
-  if (goog.isDef(layers)) {
-    var layersArray = layers.getArray();
+  var layersArray = this.map_.getLayerGroup().getLayersArray();
   var i;
   for (i = layersArray.length - 1; i >= 0; --i) {
     var layer = layersArray[i];
@@ -110,7 +108,6 @@ ol.renderer.Map.prototype.forEachFeatureAtPixel =
       }
     }
   }
-  }
   return undefined;
 };