From 54bd4516ed42be572011e5307409fcaf1f8db689 Mon Sep 17 00:00:00 2001
From: Zev Benjamin <zev@humbughq.com>
Date: Wed, 1 May 2013 20:59:15 -0400
Subject: [PATCH] Only update recent subjects after all messages in a batch
 have been processed

We were previously doing this on every message.  Because
update_recent_subjects is linear in the number of streams in the
sidebar, this became very slow when we enabled the streams sidebar
for the MIT realm.

(imported from commit 95cd71d83bbcc08cc6c5c79ca567b5d6b9b17173)
---
 zephyr/static/js/zephyr.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/zephyr/static/js/zephyr.js b/zephyr/static/js/zephyr.js
index 0ba372fc1a..72252482f9 100644
--- a/zephyr/static/js/zephyr.js
+++ b/zephyr/static/js/zephyr.js
@@ -478,8 +478,6 @@ function case_insensitive_find(term, array) {
     }).length !== 0;
 }
 
-var update_recent_subjects = $.debounce(100, ui.update_recent_subjects);
-
 function process_message_for_recent_subjects(message) {
     var current_timestamp = 0;
     var max_subjects = 5;
@@ -508,7 +506,6 @@ function process_message_for_recent_subjects(message) {
     recents = recents.slice(0, max_subjects);
 
     recent_subjects[message.stream] = recents;
-    update_recent_subjects();
 }
 
 function add_message_metadata(message, dummy) {
@@ -818,6 +815,7 @@ function get_updates(options) {
                 process_visible_unread_messages();
                 notifications.received_messages(messages);
                 compose.update_faded_messages();
+                ui.update_recent_subjects();
             }
 
             if (new_pointer !== undefined
@@ -897,6 +895,8 @@ function load_old_messages(opts) {
             add_messages(messages, opts.msg_list);
         }
 
+        ui.update_recent_subjects();
+
         if (opts.cont !== undefined) {
             opts.cont(messages);
         }