From 2a3582e92551f40c11b8ef50cf0ba3d2bf5cb503 Mon Sep 17 00:00:00 2001
From: Kyle Mathews <mathews.kyle@gmail.com>
Date: Thu, 10 Jul 2014 13:39:10 -0700
Subject: [PATCH] [changed] make URLStore.push idempotent
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If somebody’s component is observing some user
input its easy to start pushing the same url
into the store, this makes it so devs can kind
of treat `Router.transitionTo` like rendering,
nothing happens if nothing has changed.

Previously, you get a bunch of history entries
that don’t change UI as the user clicks the back
button.

closes #79
---
 modules/stores/URLStore.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/stores/URLStore.js b/modules/stores/URLStore.js
index 5e740d45d0..6cb3550d99 100644
--- a/modules/stores/URLStore.js
+++ b/modules/stores/URLStore.js
@@ -67,6 +67,9 @@ var URLStore = {
    * Pushes the given path onto the browser navigation stack.
    */
   push: function (path) {
+    if (path === _currentPath)
+      return;
+
     if (_location === 'history') {
       window.history.pushState({ path: path }, '', path);
       notifyChange();