make sure we're at the bottom, although that seems to always be the case in this branch?

src/components/structures/ScrollPanel.js

@@ -215,7 +215,9 @@ module.exports = React.createClass({
             // this might cause the scrollbar to resize in case the max-height was not correct
             // but that's better than ending up with a lot of whitespace at the bottom of the timeline.
             // we need to above check because when showing the typing notifs, an onScroll event is also triggered
+            if (!this.isAtBottom()) {
                 this.clearBlockShrinking();
+            }
 
             this._saveScrollState();
         } else {