Program: 75933
Project: 75933
Buggy source:
/** 
 * Set the associated model and add a query box with its top-level parameters, and those of its director, if it has one. All placeable objects in the hierarchy will get placed.
 * @param model The associated model.
 */
public void setModel(CompositeActor model){
  _model=model;
  if (_paramQuery != null) {
    _controlPanel.remove(_paramQuery);
    _paramQuery=null;
  }
  if (_directorQuery != null) {
    _controlPanel.remove(_directorQuery);
    _directorQuery=null;
  }
  if (_displays != null) {
    remove(_displays);
    _displays=null;
  }
  if (model != null) {
    _manager=_model.getManager();
    if ((_show & TOP_PARAMETERS) != 0) {
      List paramList=_model.attributeList(Parameter.class);
      if (paramList.size() > 0) {
        JLabel pTitle=new JLabel("String_Node_Str");
        pTitle.setForeground(new Color(0,0,128));
        _controlPanel.add(pTitle);
        _controlPanel.add(Box.createRigidArea(new Dimension(0,8)));
        _paramQuery=new Configurer(model);
        _paramQuery.setAlignmentX(LEFT_ALIGNMENT);
        _paramQuery.setBackground(null);
        _controlPanel.add(_paramQuery);
        if ((_show & DIRECTOR_PARAMETERS) != 0) {
          _controlPanel.add(Box.createRigidArea(new Dimension(0,15)));
        }
      }
    }
    if ((_show & DIRECTOR_PARAMETERS) != 0) {
      Director director=_model.getDirector();
      if (director != null) {
        List dirParamList=director.attributeList(Parameter.class);
        if (dirParamList.size() > 0) {
          JLabel pTitle=new JLabel("String_Node_Str");
          pTitle.setForeground(new Color(0,0,128));
          _controlPanel.add(pTitle);
          _controlPanel.add(Box.createRigidArea(new Dimension(0,8)));
          _directorQuery=new Configurer(model);
          _directorQuery.setAlignmentX(LEFT_ALIGNMENT);
          _directorQuery.setBackground(null);
          _controlPanel.add(_directorQuery);
        }
      }
    }
    if (_controlPanel != null && _layout == HORIZONTAL) {
      _controlPanel.add(Box.createVerticalGlue());
    }
    if (_paramQuery != null && _directorQuery != null) {
      Dimension modelSize=_paramQuery.getPreferredSize();
      Dimension directorSize=_directorQuery.getPreferredSize();
      if (directorSize.width > modelSize.width) {
        _paramQuery.setPreferredSize(new Dimension(directorSize.width,modelSize.height));
      }
 else {
        _directorQuery.setPreferredSize(new Dimension(modelSize.width,directorSize.height));
      }
    }
    _displays=new JPanel();
    _displays.setBackground(null);
    add(_displays);
    _displays.setLayout(new BoxLayout(_displays,BoxLayout.Y_AXIS));
    _displays.setBackground(null);
    for (Iterator i=_model.deepEntityList().iterator(); i.hasNext(); ) {
      Object o=i.next();
      if (o instanceof Placeable) {
        ((Placeable)o).place(_displays);
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Set the associated model and add a query box with its top-level parameters, and those of its director, if it has one. All placeable objects in the hierarchy will get placed.
 * @param model The associated model.
 */
public void setModel(CompositeActor model){
  _model=model;
  if (_paramQuery != null) {
    _controlPanel.remove(_paramQuery);
    _paramQuery=null;
  }
  if (_directorQuery != null) {
    _controlPanel.remove(_directorQuery);
    _directorQuery=null;
  }
  if (_displays != null) {
    remove(_displays);
    _displays=null;
  }
  if (model != null) {
    _manager=_model.getManager();
    if ((_show & TOP_PARAMETERS) != 0) {
      List paramList=_model.attributeList(Parameter.class);
      if (paramList.size() > 0) {
        JLabel pTitle=new JLabel("String_Node_Str");
        pTitle.setForeground(new Color(0,0,128));
        _controlPanel.add(pTitle);
        _controlPanel.add(Box.createRigidArea(new Dimension(0,8)));
        _paramQuery=new Configurer(model);
        _paramQuery.setAlignmentX(LEFT_ALIGNMENT);
        _paramQuery.setBackground(null);
        _controlPanel.add(_paramQuery);
        if ((_show & DIRECTOR_PARAMETERS) != 0) {
          _controlPanel.add(Box.createRigidArea(new Dimension(0,15)));
        }
      }
    }
    if ((_show & DIRECTOR_PARAMETERS) != 0) {
      Director director=_model.getDirector();
      if (director != null) {
        List dirParamList=director.attributeList(Parameter.class);
        if (dirParamList.size() > 0) {
          JLabel pTitle=new JLabel("String_Node_Str");
          pTitle.setForeground(new Color(0,0,128));
          _controlPanel.add(pTitle);
          _controlPanel.add(Box.createRigidArea(new Dimension(0,8)));
          _directorQuery=new Configurer(director);
          _directorQuery.setAlignmentX(LEFT_ALIGNMENT);
          _directorQuery.setBackground(null);
          _controlPanel.add(_directorQuery);
        }
      }
    }
    if (_controlPanel != null && _layout == HORIZONTAL) {
      _controlPanel.add(Box.createVerticalGlue());
    }
    if (_paramQuery != null && _directorQuery != null) {
      Dimension modelSize=_paramQuery.getPreferredSize();
      Dimension directorSize=_directorQuery.getPreferredSize();
      if (directorSize.width > modelSize.width) {
        _paramQuery.setPreferredSize(new Dimension(directorSize.width,modelSize.height));
      }
 else {
        _directorQuery.setPreferredSize(new Dimension(modelSize.width,directorSize.height));
      }
    }
    _displays=new JPanel();
    _displays.setBackground(null);
    add(_displays);
    _displays.setLayout(new BoxLayout(_displays,BoxLayout.Y_AXIS));
    _displays.setBackground(null);
    for (Iterator i=_model.deepEntityList().iterator(); i.hasNext(); ) {
      Object o=i.next();
      if (o instanceof Placeable) {
        ((Placeable)o).place(_displays);
      }
    }
  }
}