From c38841c5af666f1cf87c943cb2f308c4c244ac37 Mon Sep 17 00:00:00 2001
From: Logan Tegman <ltegman@gmail.com>
Date: Wed, 4 Nov 2015 11:04:54 -0800
Subject: [PATCH] Fix Code Editor Changes Creating Duplicate History Entries

Closes #4167
---
 client/commonFramework.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/client/commonFramework.js b/client/commonFramework.js
index 20ba4b40e1..ef3427928c 100644
--- a/client/commonFramework.js
+++ b/client/commonFramework.js
@@ -136,8 +136,16 @@ common.codeUri = (function(common, encode, decode, location, history) {
       if (!codeUri.enabled) {
         return null;
       }
-      location.hash = '?solution=' +
-        codeUri.encode(encodeFcc(solution));
+      if (history && typeof history.replaceState === 'function') {
+        history.replaceState(
+          history.state,
+          null,
+          '?solution=' + codeUri.encode(encodeFcc(solution))
+        );
+      } else {
+        location.hash = '?solution=' +
+          codeUri.encode(encodeFcc(solution));
+      }
 
       return solution;
     },