anchor.diff:  
     recvTakeTrick(seatNum) {
       _action = NONE;
  +    sweepDirection = _seatToLocation(seatNum);
       sweepTimer = new Timer(new Duration(seconds:2), () => _sweep());
       table.recvChat("Table", "Seat $seatNum took down the trick");
       _changed();
  
positive.code:   }
  
    _sweep() {
      if (sweepTimer != null && sweepTimer.isActive) {
        sweepTimer.cancel();
        sweepTimer = null;
  
negative.code:     var suit = card['suit'];
      var playedCard = new Card(value, suit);
  
      _sweep();
  
      if (seatNum == seat) {
        cards.remove(playedCard);
  