From b362ea0fcc992d0468772384ee77be7069d24dc7 Mon Sep 17 00:00:00 2001
From: Brad Dunbar <dunbarb2@gmail.com>
Date: Tue, 4 Mar 2014 11:35:31 -0500
Subject: [PATCH] Fix #3015 - History#stop cleans up iframe.

---
 backbone.js        |  8 ++++++++
 test/collection.js | 18 +++++++++++-------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/backbone.js b/backbone.js
index 99713a8b9..5fcda3f05 100644
--- a/backbone.js
+++ b/backbone.js
@@ -1494,11 +1494,19 @@
         return detachEvent('on' + eventName, listener);
       };
 
+      // Remove window listeners.
       if (this._hasPushState) {
         removeEventListener('popstate', this.checkUrl, false);
       } else if (this._wantsHashChange && this._hasHashChange && !this.iframe) {
         removeEventListener('hashchange', this.checkUrl, false);
       }
+
+      // Clean up the iframe if necessary.
+      if (this.iframe) {
+        document.body.removeChild(this.iframe.frameElement);
+        this.iframe = null;
+      }
+
       // Some environments will throw when clearing an undefined interval.
       if (this._checkUrlInterval) clearInterval(this._checkUrlInterval);
       History.started = false;
diff --git a/test/collection.js b/test/collection.js
index a3b9209cc..0f9d0d4cd 100644
--- a/test/collection.js
+++ b/test/collection.js
@@ -61,14 +61,17 @@
   });
 
   test("clone preserves model and comparator", 3, function() {
-    var Model = Backbone.Model.extend(),
-        comparator = function() {};
+    var Model = Backbone.Model.extend();
+    var comparator = function(model){ return model.id; };
 
-    var col = (new Backbone.Collection([{id: 1}], {model: Model, comparator: comparator})).clone();
-    col.add({id: 2});
-    ok(col.at(0) instanceof Model);
-    ok(col.at(1) instanceof Model);
-    strictEqual(col.comparator, comparator);
+    var collection = new Backbone.Collection([{id: 1}], {
+      model: Model,
+      comparator: comparator
+    }).clone();
+    collection.add({id: 2});
+    ok(collection.at(0) instanceof Model);
+    ok(collection.at(1) instanceof Model);
+    strictEqual(collection.comparator, comparator);
   });
 
   test("get", 6, function() {
@@ -1358,4 +1361,5 @@
     collection.first().set({id: 1}, {silent: true});
     equal(collection.get(1), collection.first());
   });
+
 })();