Program: 159505
Project: 159505
Buggy source:
@Override public void loadCards(CardsView showCards,SortSetting sortSetting,boolean piles,BigCard bigCard,UUID gameId,boolean merge){
  if (this.sortSetting == null) {
    this.sortSetting=sortSetting;
  }
  this.bigCard=bigCard;
  this.gameId=gameId;
  int landCount=0;
  int creatureCount=0;
  if (!merge) {
    this.clearCards();
    for (    CardView card : showCards.values()) {
      addCard(card,bigCard,gameId);
    }
  }
 else {
    for (    CardView card : showCards.values()) {
      if (!cards.containsKey(card.getId())) {
        addCard(card,bigCard,gameId);
      }
      if (updateCountsCallback != null) {
        if (card.getCardTypes().contains(CardType.LAND)) {
          landCount++;
        }
        if (card.getCardTypes().contains(CardType.CREATURE)) {
          creatureCount++;
        }
      }
    }
    for (Iterator<Entry<UUID,CardView>> i=cards.entrySet().iterator(); i.hasNext(); ) {
      Entry<UUID,CardView> entry=i.next();
      if (!showCards.containsKey(entry.getKey())) {
        i.remove();
        if (displayNoCopies) {
          String key=entry.getValue().getName() + entry.getValue().getExpansionSetCode() + entry.getValue().getCardNumber();
          if (cardsNoCopies.containsKey(key)) {
            Integer count=cardsNoCopies.get(key);
            count--;
            if (count > 0) {
              cardsNoCopies.put(key,count);
            }
 else {
              cardsNoCopies.remove(key);
            }
            for (int j=0; j < view.size(); j++) {
              CardView cv=view.get(j);
              if (cv.getId().equals(entry.getValue().getId())) {
                if (count > 0) {
                  String key1=cv.getName() + cv.getExpansionSetCode() + cv.getCardNumber();
                  for (                  CardView cardView : cards.values()) {
                    String key2=cardView.getName() + cardView.getExpansionSetCode() + cardView.getCardNumber();
                    if ((key1).equals(key2)) {
                      view.set(j,cardView);
                      break;
                    }
                  }
                }
 else {
                  view.remove(j);
                }
                break;
              }
            }
          }
        }
 else {
          for (          CardView cv : view) {
            if (cv.getId().equals(entry.getKey())) {
              view.remove(cv);
              break;
            }
          }
        }
      }
    }
    if (updateCountsCallback != null) {
      updateCountsCallback.update(cards.size(),creatureCount,landCount);
    }
  }
  sort(this.sortSetting.getSortIndex(),this.sortSetting.isAscending());
  drawCards(sortSetting,piles);
}

Fixed version (ground truth):
@Override public void loadCards(CardsView showCards,SortSetting sortSetting,BigCard bigCard,UUID gameId,boolean merge){
  if (this.sortSetting == null) {
    this.sortSetting=sortSetting;
  }
  this.bigCard=bigCard;
  this.gameId=gameId;
  int landCount=0;
  int creatureCount=0;
  if (!merge) {
    this.clearCards();
    for (    CardView card : showCards.values()) {
      addCard(card,bigCard,gameId);
    }
  }
 else {
    for (    CardView card : showCards.values()) {
      if (!cards.containsKey(card.getId())) {
        addCard(card,bigCard,gameId);
      }
      if (updateCountsCallback != null) {
        if (card.getCardTypes().contains(CardType.LAND)) {
          landCount++;
        }
        if (card.getCardTypes().contains(CardType.CREATURE)) {
          creatureCount++;
        }
      }
    }
    for (Iterator<Entry<UUID,CardView>> i=cards.entrySet().iterator(); i.hasNext(); ) {
      Entry<UUID,CardView> entry=i.next();
      if (!showCards.containsKey(entry.getKey())) {
        i.remove();
        if (displayNoCopies) {
          String key=entry.getValue().getName() + entry.getValue().getExpansionSetCode() + entry.getValue().getCardNumber();
          if (cardsNoCopies.containsKey(key)) {
            Integer count=cardsNoCopies.get(key);
            count--;
            if (count > 0) {
              cardsNoCopies.put(key,count);
            }
 else {
              cardsNoCopies.remove(key);
            }
            for (int j=0; j < view.size(); j++) {
              CardView cv=view.get(j);
              if (cv.getId().equals(entry.getValue().getId())) {
                if (count > 0) {
                  String key1=cv.getName() + cv.getExpansionSetCode() + cv.getCardNumber();
                  for (                  CardView cardView : cards.values()) {
                    String key2=cardView.getName() + cardView.getExpansionSetCode() + cardView.getCardNumber();
                    if ((key1).equals(key2)) {
                      view.set(j,cardView);
                      break;
                    }
                  }
                }
 else {
                  view.remove(j);
                }
                break;
              }
            }
          }
        }
 else {
          for (          CardView cv : view) {
            if (cv.getId().equals(entry.getKey())) {
              view.remove(cv);
              break;
            }
          }
        }
      }
    }
    if (updateCountsCallback != null) {
      updateCountsCallback.update(cards.size(),creatureCount,landCount);
    }
  }
  sort(this.sortSetting.getSortIndex(),this.sortSetting.isAscending());
  drawCards(sortSetting);
}