message: Make note of inconsistant roomReadMarkerTsMap
  This will become redundant when there is server support for directionality of the RM
diff: @@ -478,6 +478,9 @@ var TimelinePanel = React.createClass({
  if (ev.getType() !== "m.fully_read") return;
  + // XXX: roomReadMarkerTsMap not updated here so it is now inconsistent. Replace
  + // this mechanism of determining where the RM is relative to the view-port with
  + // one supported by the server (the client needs more than an event ID).
  this.setState({
  readMarkerEventId: ev.getContent().event_id,
  }, this.props.onReadMarkerUpdated);
  