From 4febc63aeecee7613681749b3aa435cbd25ea17f Mon Sep 17 00:00:00 2001
From: Luke Barnard <lukeb@openmarket.com>
Date: Tue, 2 May 2017 17:41:09 +0100
Subject: [PATCH] Add comment to _scrollToToken

---
 src/components/structures/ScrollPanel.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/components/structures/ScrollPanel.js b/src/components/structures/ScrollPanel.js
index 7fa320d784..3f36fac89b 100644
--- a/src/components/structures/ScrollPanel.js
+++ b/src/components/structures/ScrollPanel.js
@@ -555,6 +555,9 @@ module.exports = React.createClass({
         var messages = this.refs.itemlist.children;
         for (var i = messages.length-1; i >= 0; --i) {
             var m = messages[i];
+            // 'data-contained-scroll-tokens' has been set, indicating that a child
+            // element contains elements that each have a token. Check this array of
+            // tokens for `scrollToken`.
             if (m.dataset.containedScrollTokens &&
                 m.dataset.containedScrollTokens.indexOf(scrollToken) !== -1) {
                 node = m;