message: mounted can be set straight in componentWillMount
diff: @@ -42,7 +42,7 @@ module.exports = React.createClass({
  },
  componentWillMount: function() {
  - this._mounted = false;
  + this._mounted = true;
  const cli = MatrixClientPeg.get();
  if (cli.hasLazyLoadMembersEnabled()) {
  // true means will not show a spinner but the
  @@ -73,10 +73,6 @@ module.exports = React.createClass({
  // cli.on("Room.timeline", this.onRoomTimeline);
  },
  - componentDidMount: async function() {
  - this._mounted = true;
  - },
  -
  componentWillUnmount: function() {
  this._mounted = false;
  const cli = MatrixClientPeg.get();
  