From ab1fca9fdb883f49303d58a64952d0d34d76b987 Mon Sep 17 00:00:00 2001
From: Jonathan Frederic <jon.freder@gmail.com>
Date: Mon, 15 Dec 2014 16:30:23 -0800
Subject: [PATCH] Prevent the page from jumping on tree tab change

---
 IPython/html/static/tree/js/main.js | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/IPython/html/static/tree/js/main.js b/IPython/html/static/tree/js/main.js
index 194bd385b..2b1f15190 100644
--- a/IPython/html/static/tree/js/main.js
+++ b/IPython/html/static/tree/js/main.js
@@ -140,8 +140,19 @@ require([
     });
     
     // set hash on tab click
-    $("#tabs").find("a").click(function() {
-        window.location.hash = $(this).attr("href");
+    $("#tabs").find("a").click(function(e) {
+        // Prevent the document from jumping when the active tab is changed to a 
+        // tab that has a lot of content.
+        e.preventDefault();
+
+        // Set the hash without causing the page to jump.
+        // http://stackoverflow.com/a/14690177/2824256
+        var hash = $(this).attr("href");
+        if(window.history.pushState) {
+            window.history.pushState(null, null, hash);
+        } else {
+            window.location.hash = hash;
+        }
     });
     
     // load tab if url hash