From eb43cf14c1c3b609b9dcbad18b2d635fff779609 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Wed, 18 Jul 2012 23:37:12 +0200
Subject: [PATCH] Clean up layer renderers when layers changes

---
 src/ol/map.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/ol/map.js b/src/ol/map.js
index 1e81b6dc7c..0a1fd4ced6 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -442,12 +442,21 @@ ol.Map.prototype.handleLayersSetAt = function(event) {
 /**
  */
 ol.Map.prototype.handleLayersChanged = function() {
+  var layerRenderers = goog.object.getValues(this.layerRenderers);
+  goog.array.forEach(layerRenderers, function(layerRenderer) {
+    this.removeLayerRenderer(layerRenderer);
+  }, this);
+  this.layerRenderers = {};
   if (!goog.isNull(this.layersListenerKeys_)) {
     goog.array.forEach(this.layersListenerKeys_, goog.events.unlistenByKey);
     this.layersListenerKeys_ = null;
   }
   var layers = this.getLayers();
   if (goog.isDefAndNotNull(layers)) {
+    goog.array.forEach(layers.getArray(), function(layer) {
+      var layerRenderer = this.createLayerRenderer(layer);
+      this.setLayerRenderer(layer, layerRenderer);
+    }, this);
     this.layersListenerKeys_ = [
       goog.events.listen(layers, ol.ArrayEventType.INSERT_AT,
           this.handleLayersInsertAt, false, this),