message: try to make hiding events work with read markers
diff: @@ -341,6 +341,9 @@ module.exports = React.createClass({
  let last = (i == lastShownEventIndex);
  if (!this._shouldShowEvent(mxEv)) {
  + if (mxEv.getId() === this.props.readMarkerEventId) {
  + ret.push(this._getReadMarkerTile(this.props.readMarkerVisible));
  + }
  continue;
  }
  