From 3d1f42dc0a50b2dfc3230028fa715f61916eeb4b 2014-11-20 00:44:35
From: Jason Grout <jgrout6@bloomberg.net>
Date: 2014-11-20 00:44:35
Subject: [PATCH] Make a copy of the input list so that changes to the children list don't automagically change our reference list

---

diff --git a/IPython/html/static/widgets/js/widget.js b/IPython/html/static/widgets/js/widget.js
index 1f3c919..5c87bdc 100644
--- a/IPython/html/static/widgets/js/widget.js
+++ b/IPython/html/static/widgets/js/widget.js
@@ -643,7 +643,8 @@ define(["widgets/js/manager",
                 for (; i < new_models.length; i++) {
                     added_views.push(create.call(context, new_models[i]));
                 }
-                that._models = new_models;
+                // make a copy of the input array
+                that._models = new_models.slice();
                 return Promise.all(added_views, function(added) {
                     that.views = that.views.slice(0,first_removed).concat(added);
                 });