From 7faffc2de7993bfbb86fa9c573596e26a34f1e69 Mon Sep 17 00:00:00 2001
From: cacaodev <cacaodev@gmail.com>
Date: Fri, 6 May 2016 18:16:12 +0200
Subject: [PATCH] Use cancelAnimationFrame when available

---
 AppKit/CoreAnimation/CPAnimationContext.j | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/AppKit/CoreAnimation/CPAnimationContext.j b/AppKit/CoreAnimation/CPAnimationContext.j
index f39bf912c..797a7cfdf 100644
--- a/AppKit/CoreAnimation/CPAnimationContext.j
+++ b/AppKit/CoreAnimation/CPAnimationContext.j
@@ -612,6 +612,7 @@ CFRunLoopRemoveObserver = function(runloop, observer, mode)
 var FrameUpdater = function(anIdentifier)
 {
     this._identifier = anIdentifier;
+    this._requestId = null;
     this._duration = 0;
     this._stop = false;
     this._targets = [];
@@ -636,11 +637,15 @@ var FrameUpdater = function(anIdentifier)
 
 FrameUpdater.prototype.start = function()
 {
-    window.requestAnimationFrame(this._updateFunction);
+    this._requestId = window.requestAnimationFrame(this._updateFunction);
 };
 
 FrameUpdater.prototype.stop = function()
 {
+    // window.cancelAnimationFrame support is Chrome 24, Firefox 23, IE 10, Opera 15, Safari 6.1
+    if (window.cancelAnimationFrame)
+        window.cancelAnimationFrame(this._requestId);
+
     this._stop = true;
 };