From c742c14a52ddc30521b1dd77e63564c03ad3b574 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Thu, 17 Jan 2013 16:24:15 +0100
Subject: [PATCH] Safeguard against listeners that recreate the grid

We need to handle the backbuffer before we fire the loadend event.
Otherwise listeners that call e.g. mergeNewParams() will cause the
backbuffer removal code to fail, because tile.imgDiv (and hence
this._transitionElement) will be null.
---
 lib/OpenLayers/Layer/Grid.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 96a5f8f394..6989594fa3 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -1104,8 +1104,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
             }
             //if that was the last tile, then trigger a 'loadend' on the layer
             if (this.numLoadingTiles === 0) {
-                this.loading = false;
-                this.events.triggerEvent("loadend");
                 if(this.backBuffer) {
                     this._transitionElement = tile.imgDiv;
                     for (var i=this.transitionendEvents.length-1; i>=0; --i) {
@@ -1119,6 +1117,8 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
                         this._removeBackBuffer, this.removeBackBufferDelay
                     );
                 }
+                this.loading = false;
+                this.events.triggerEvent("loadend");
             }
         };