From 1787339eaea2fc76f42838a256ccba26eeb4f854 Mon Sep 17 00:00:00 2001
From: Sammy Jelin <sjelin@gmail.com>
Date: Fri, 18 Mar 2016 16:46:25 -0700
Subject: [PATCH] fix(browser/utils): calling removeEventListener twice with
 the same args should not cause errors

Closes #283

Closes #284
---
 lib/browser/utils.ts         | 2 +-
 test/browser/element.spec.ts | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/browser/utils.ts b/lib/browser/utils.ts
index 6e12b9eaf..5d7ef7375 100644
--- a/lib/browser/utils.ts
+++ b/lib/browser/utils.ts
@@ -195,7 +195,7 @@ function zoneAwareRemoveEventListener(self: any, args: any[]) {
   // - When `addEventListener` is called on the global context in strict mode, `this` is undefined
   // see https://github.com/angular/zone.js/issues/190
   var target = self || _global;
-  var eventTask = findExistingRegisteredTask(target, handler, eventName, useCapturing, false);
+  var eventTask = findExistingRegisteredTask(target, handler, eventName, useCapturing, true);
   if (eventTask) {
     eventTask.zone.cancelTask(eventTask);
   } else {
diff --git a/test/browser/element.spec.ts b/test/browser/element.spec.ts
index c128757bd..b8e2b371d 100644
--- a/test/browser/element.spec.ts
+++ b/test/browser/element.spec.ts
@@ -257,6 +257,13 @@ describe('element', function () {
       button.click();
       expect(log).toEqual('');
     });
+
+    it('should be able to deregister the same event twice', function() {
+      var listener = (event) => {};
+      document.body.addEventListener('click', listener, false);
+      document.body.removeEventListener('click', listener, false);
+      document.body.removeEventListener('click', listener, false);
+    });
   });
 
 });