From 7cbf031f185623193a84524dab74caf6889adf41 Mon Sep 17 00:00:00 2001
From: Steve Howell <showell@zulipchat.com>
Date: Thu, 6 Dec 2018 21:59:05 +0000
Subject: [PATCH] hashchange: Add warning if pushState is not available.

---
 frontend_tests/node_tests/hashchange.js | 3 +++
 static/js/hashchange.js                 | 1 +
 2 files changed, 4 insertions(+)

diff --git a/frontend_tests/node_tests/hashchange.js b/frontend_tests/node_tests/hashchange.js
index f961a1c6ab..d267c56b28 100644
--- a/frontend_tests/node_tests/hashchange.js
+++ b/frontend_tests/node_tests/hashchange.js
@@ -303,7 +303,10 @@ run_test('save_narrow', () => {
         {operator: 'is', operand: 'private'},
     ];
 
+    blueslip.set_test_data('warn', 'browser does not support pushState');
     hashchange.save_narrow(operators);
+    blueslip.clear_test_data();
+
     helper.assert_events([
         'message_viewport.stop_auto_scrolling',
         'favicon.reset',
diff --git a/static/js/hashchange.js b/static/js/hashchange.js
index 21a813de86..2388148c0d 100644
--- a/static/js/hashchange.js
+++ b/static/js/hashchange.js
@@ -31,6 +31,7 @@ function set_hash(hash) {
         var url = get_full_url(hash);
         history.pushState(null, null, url);
     } else {
+        blueslip.warn('browser does not support pushState');
         window.location.hash = hash;
     }
 }