message: Make the is-alone check use efficient methods
diff: @@ -729,8 +729,8 @@ module.exports = React.createClass({
  return;
  }
  - const joinedMembers = room.currentState.getMembers().filter((m) => m.membership === "join" || m.membership === "invite");
  - this.setState({isAlone: joinedMembers.length === 1});
  + const joinedOrInvitedMemberCount = room.getJoinedMemberCount() + room.getInvitedMemberCount();
  + this.setState({isAlone: joinedOrInvitedMemberCount === 1});
  },
  _updateConfCallNotification: function() {
  