From a86151c9e329c0dd25ca3eded91b759f70860eb5 Mon Sep 17 00:00:00 2001
From: Tim Schaub <tim.schaub@gmail.com>
Date: Mon, 2 Jan 2012 20:39:38 -0700
Subject: [PATCH] Allow callback to cancel animation.

---
 lib/OpenLayers/Util.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/OpenLayers/Util.js b/lib/OpenLayers/Util.js
index 71a64c06b3..fe9f49ac84 100644
--- a/lib/OpenLayers/Util.js
+++ b/lib/OpenLayers/Util.js
@@ -1720,7 +1720,9 @@ OpenLayers.Util.requestAnimationFrame = (function() {
         loops[id] = function() {
             if (loops[id] && +new Date - start <= duration) {
                 callback();
-                request(loops[id], element);
+                if (loops[id]) {
+                    request(loops[id], element);
+                }
             } else {
                 delete loops[id];
             }