message: Prevent the ghost and real RM tile from both appearing
diff: @@ -386,9 +386,7 @@ module.exports = React.createClass({
  ret.push(this._getReadMarkerTile(visible));
  readMarkerVisible = visible;
  isVisibleReadMarker = visible;
  - }
  -
  - if (eventId == this.currentGhostEventId) {
  + } else if (eventId == this.currentGhostEventId) {
  // if we're showing an animation, continue to show it.
  ret.push(this._getReadMarkerGhostTile());
  } else if (!isVisibleReadMarker &&
  