message: Update tab-complete state onRoom received after joining
  As opposed to doing it when the component mounts.
  Fixes (hopefully)
diff: @@ -234,8 +234,6 @@ module.exports = React.createClass({
  // making it impossible to indicate a newly joined room.
  const room = this.state.room;
  if (room) {
  - UserProvider.getInstance().setUserListFromRoom(room);
  - this.tabComplete.loadEntries(room);
  this.setState({
  unsentMessageError: this._getUnsentMessageError(room),
  });
  @@ -523,6 +521,8 @@ module.exports = React.createClass({
  this._warnAboutEncryption(room);
  this._calculatePeekRules(room);
  this._updatePreviewUrlVisibility(room);
  + this.tabComplete.loadEntries(room);
  + UserProvider.getInstance().setUserListFromRoom(room);
  },
  _warnAboutEncryption: function(room) {
  