message: Undo change in ghost RM logic
  Put a XXX to indicate that the ghost tile should be replaced with something mor e stable. As it stands, the ghost will appear, potentially at a different position to the RMs actual position
diff: @@ -386,7 +386,11 @@ module.exports = React.createClass({
  ret.push(this._getReadMarkerTile(visible));
  readMarkerVisible = visible;
  isVisibleReadMarker = visible;
  - } else if (eventId == this.currentGhostEventId) {
  + }
  +
  + // XXX: there should be no need for a ghost tile - we should just use a
  + // a dispatch to start the RM animation.
  + if (eventId == this.currentGhostEventId) {
  // if we're showing an animation, continue to show it.
  ret.push(this._getReadMarkerGhostTile());
  } else if (!isVisibleReadMarker &&
  