Program: 8868
Project: 8868
Buggy source:
@Override public void initialize(final AppStateManager stateManager,final Application app){
  super.initialize(stateManager,app);
  this.app=(Main)app;
  assetManager=this.app.getAssetManager();
  this.stateManager=this.app.getStateManager();
  inputManager=this.app.getInputManager();
  gameState=this.stateManager.getState(GameState.class);
  PlayerScreenController psc=this.stateManager.getState(PlayerState.class).getScreen();
  this.view=psc.getGuiConstraint();
  this.tooltip=psc.getTooltip();
  keeperHand=new KeeperHand(assetManager,(int)gameState.getLevelVariable(MiscType.MAX_NUMBER_OF_THINGS_IN_HAND));
  this.app.getGuiNode().attachChild(keeperHand.getNode());
  selectionHandler=new SelectionHandler(this.app){
    @Override public boolean isVisible(){
      if (isTaggable || selectionHandler.isActive()) {
        return true;
      }
      if (!isOnMap) {
        return false;
      }
switch (interactionState.getType()) {
case NONE:
        return (keeperHand.getItem() != null);
case SELL:
case ROOM:
case DOOR:
case TRAP:
      return true;
  }
  return false;
}
@Override protected SelectionHandler.ColorIndicator getColorIndicator(){
  Vector2f pos;
  if (selectionHandler.isActive()) {
    pos=selectionHandler.getSelectionArea().getRealStart();
  }
 else {
    pos=selectionHandler.getPointedTilePosition();
  }
  if (interactionState.getType() == Type.NONE && keeperHand.getItem() != null) {
    TileData tile=getWorldHandler().getMapData().getTile((int)pos.x,(int)pos.y);
    IInteractiveControl.DroppableStatus status=keeperHand.peek().getDroppableStatus(tile);
    return (status != IInteractiveControl.DroppableStatus.NOT_DROPPABLE ? ColorIndicator.BLUE : ColorIndicator.RED);
  }
  if (interactionState.getType() == Type.SELL) {
    return ColorIndicator.RED;
  }
 else   if (interactionState.getType() == Type.ROOM && !(getWorldHandler().isTaggable((int)pos.x,(int)pos.y) || (getWorldHandler().isBuildable((int)pos.x,(int)pos.y,player,gameState.getLevelData().getRoomById(interactionState.getItemId())) && isPlayerAffordToBuild(player,gameState.getLevelData().getRoomById(interactionState.getItemId()))))) {
    return ColorIndicator.RED;
  }
  return ColorIndicator.BLUE;
}
private boolean isPlayerAffordToBuild(Player player,Room room){
  int playerMoney=getWorldHandler().getGameState().getPlayer(player.getPlayerId()).getGoldControl().getGold();
  if (playerMoney == 0) {
    return false;
  }
  int buildablePlots=0;
  for (int x=(int)Math.max(0,selectionHandler.getSelectionArea().getStart().x); x < Math.min(getWorldHandler().getMapData().getWidth(),selectionHandler.getSelectionArea().getEnd().x + 1); x++) {
    for (int y=(int)Math.max(0,selectionHandler.getSelectionArea().getStart().y); y < Math.min(getWorldHandler().getMapData().getHeight(),selectionHandler.getSelectionArea().getEnd().y + 1); y++) {
      if (getWorldHandler().isBuildable(x,y,player,room)) {
        buildablePlots++;
      }
      if (buildablePlots > 3) {
        return false;
      }
    }
  }
  return true;
}
}
;
CheatState cheatState=new CheatState(app){
@Override public void onSuccess(CheatState.CheatType cheat){
switch (cheat) {
case MONEY:
    getWorldHandler().addGold(player.getPlayerId(),100000);
  break;
case MANA:
gameState.getPlayer(player.getPlayerId()).getManaControl().addMana(100000);
break;
default :
logger.log(Level.WARNING,"String_Node_Str",cheat.toString());
}
}
}
;
this.stateManager.attach(cheatState);
if (isEnabled()) {
setEnabled(true);
}
}

Fixed version (ground truth):
@Override public void initialize(final AppStateManager stateManager,final Application app){
  super.initialize(stateManager,app);
  this.app=(Main)app;
  assetManager=this.app.getAssetManager();
  this.stateManager=this.app.getStateManager();
  inputManager=this.app.getInputManager();
  gameState=this.stateManager.getState(GameState.class);
  PlayerScreenController psc=this.stateManager.getState(PlayerState.class).getScreen();
  this.view=psc.getGuiConstraint();
  this.tooltip=psc.getTooltip();
  keeperHand=new KeeperHand(assetManager,(int)gameState.getLevelVariable(MiscType.MAX_NUMBER_OF_THINGS_IN_HAND));
  this.app.getGuiNode().attachChild(keeperHand.getNode());
  selectionHandler=new SelectionHandler(this.app){
    @Override public boolean isVisible(){
      if (isTaggable || selectionHandler.isActive()) {
        return true;
      }
      if (!isOnMap) {
        return false;
      }
switch (interactionState.getType()) {
case NONE:
        return (keeperHand.getItem() != null);
case SELL:
case ROOM:
case DOOR:
case TRAP:
      return true;
  }
  return false;
}
@Override protected SelectionHandler.ColorIndicator getColorIndicator(){
  Vector2f pos;
  if (selectionHandler.isActive()) {
    pos=selectionHandler.getSelectionArea().getRealStart();
  }
 else {
    pos=selectionHandler.getPointedTilePosition();
  }
  if (interactionState.getType() == Type.NONE && keeperHand.getItem() != null) {
    TileData tile=getWorldHandler().getMapData().getTile((int)pos.x,(int)pos.y);
    IInteractiveControl.DroppableStatus status=keeperHand.peek().getDroppableStatus(tile);
    return (status != IInteractiveControl.DroppableStatus.NOT_DROPPABLE ? ColorIndicator.BLUE : ColorIndicator.RED);
  }
  if (interactionState.getType() == Type.SELL) {
    return ColorIndicator.RED;
  }
 else   if (interactionState.getType() == Type.ROOM && !(getWorldHandler().isTaggable((int)pos.x,(int)pos.y) || (getWorldHandler().isBuildable((int)pos.x,(int)pos.y,player,gameState.getLevelData().getRoomById(interactionState.getItemId())) && isPlayerAffordToBuild(player,gameState.getLevelData().getRoomById(interactionState.getItemId()))))) {
    return ColorIndicator.RED;
  }
  return ColorIndicator.BLUE;
}
private boolean isPlayerAffordToBuild(Player player,Room room){
  int playerMoney=getWorldHandler().getGameState().getPlayer(player.getPlayerId()).getGoldControl().getGold();
  if (playerMoney == 0) {
    return false;
  }
  int buildablePlots=0;
  for (int x=(int)Math.max(0,selectionHandler.getSelectionArea().getStart().x); x < Math.min(getWorldHandler().getMapData().getWidth(),selectionHandler.getSelectionArea().getEnd().x + 1); x++) {
    for (int y=(int)Math.max(0,selectionHandler.getSelectionArea().getStart().y); y < Math.min(getWorldHandler().getMapData().getHeight(),selectionHandler.getSelectionArea().getEnd().y + 1); y++) {
      if (getWorldHandler().isBuildable(x,y,player,room)) {
        buildablePlots++;
      }
      if (playerMoney < buildablePlots * room.getCost()) {
        return false;
      }
    }
  }
  return true;
}
}
;
CheatState cheatState=new CheatState(app){
@Override public void onSuccess(CheatState.CheatType cheat){
switch (cheat) {
case MONEY:
    getWorldHandler().addGold(player.getPlayerId(),100000);
  break;
case MANA:
gameState.getPlayer(player.getPlayerId()).getManaControl().addMana(100000);
break;
default :
logger.log(Level.WARNING,"String_Node_Str",cheat.toString());
}
}
}
;
this.stateManager.attach(cheatState);
if (isEnabled()) {
setEnabled(true);
}
}