From d12e3d1bc6fa067834af64d7fb0cf99a1950b18b 2014-09-14 15:46:12
From: Sylvain Corlay <scorlay@bloomberg.net>
Date: 2014-09-14 15:46:12
Subject: [PATCH] Destroy backbone model on comm:close

---

diff --git a/IPython/html/static/widgets/js/widget.js b/IPython/html/static/widgets/js/widget.js
index 8dcda6d..c0272d0 100644
--- a/IPython/html/static/widgets/js/widget.js
+++ b/IPython/html/static/widgets/js/widget.js
@@ -52,6 +52,7 @@ define(["widgets/js/manager",
         _handle_comm_closed: function (msg) {
             // Handle when a widget is closed.
             this.trigger('comm:close');
+            this.comm.model.trigger('destroy', this.comm.model);
             delete this.comm.model; // Delete ref so GC will collect widget model.
             delete this.comm;
             delete this.model_id; // Delete id from model so widget manager cleans up.