message: Hopefully make comment clearer
diff: @@ -164,9 +164,12 @@ module.exports = React.createClass({
  // switching rooms. Therefore, if the room ID changes, we
  // ignore this. We either need to do this or add code to handle
  // saving the scroll position (otherwise we end up saving the
  - // scroll position against the wrong room). Given that doing the
  - // setState here would cause a bunch of unnecessary work, we
  - // just ignore the change.
  + // scroll position against the wrong room).
  +
  + // Given that doing the setState here would cause a bunch of
  + // unnecessary work, we just ignore the change since we know
  + // that if the current room ID has changed from what we thought
  + // it was, it means we're about to be unmounted.
  return;
  }
  