Program: 49851
Project: 49851
Buggy source:
private void initComponents(){
  setLayout(new BoxLayout(this,BoxLayout.PAGE_AXIS));
  JPanel namePanel=new JPanel();
  namePanel.setOpaque(false);
  namePanel.add(UiUtility.createJLabel(Messages.getString("String_Node_Str")));
  namePanel.add(mPieceNameField);
  mImageButton.setToolTipText(Messages.getString("String_Node_Str"));
  mImageButton.setPreferredSize(new Dimension(75,75));
  namePanel.add(mImageButton);
  JPanel allMovementsPanel=new JPanel();
  allMovementsPanel.setOpaque(false);
  allMovementsPanel.setLayout(new GridBagLayout());
  allMovementsPanel.setBorder(BorderFactory.createEmptyBorder(10,10,0,10));
  GridBagConstraints gbc=new GridBagConstraints();
  gbc.fill=GridBagConstraints.BOTH;
  gbc.weightx=1.0;
  gbc.weighty=1.0;
  gbc.gridwidth=3;
  allMovementsPanel.add(namePanel,gbc);
  dataStream().forEachOrdered(data -> {
    createScrollPane(allMovementsPanel,data.list,data.buttons,data.title);
    data.buttons.addAddActionListener(e -> data.showInputDialog.accept(false));
    data.buttons.addEditActionListener(e -> data.showInputDialog.accept(true));
    data.buttons.addRemoveActionListener(e -> data.model.remove(data.list.getSelectedIndex()));
    data.list.addListSelectionListener(e -> refreshButtonState(data));
  }
);
  JPanel boardPanels=new JPanel();
  boardPanels.setOpaque(false);
  boardPanels.setLayout(new BoxLayout(boardPanels,BoxLayout.LINE_AXIS));
  boardPanels.add(Box.createHorizontalGlue());
  boardPanels.add(mBoardPanel);
  boardPanels.add(Box.createHorizontalGlue());
  boardPanels.addComponentListener(new ComponentListener(){
    @Override public void componentResized(    ComponentEvent e){
      mBoardPanel.updateDimensions(e.getComponent().getWidth(),e.getComponent().getHeight());
    }
    @Override public void componentMoved(    ComponentEvent e){
    }
    @Override public void componentShown(    ComponentEvent e){
    }
    @Override public void componentHidden(    ComponentEvent e){
    }
  }
);
  JSplitPane splitPane=new JSplitPane(JSplitPane.VERTICAL_SPLIT,allMovementsPanel,boardPanels);
  splitPane.setPreferredSize(new Dimension(755,475));
  splitPane.setDividerLocation(230);
  splitPane.setOpaque(false);
  splitPane.setDividerSize(0);
  splitPane.setResizeWeight(0.3);
  splitPane.setEnabled(false);
  add(splitPane);
}

Fixed version (ground truth):
private void initComponents(){
  setLayout(new BoxLayout(this,BoxLayout.PAGE_AXIS));
  JPanel namePanel=new JPanel();
  namePanel.setOpaque(false);
  namePanel.add(UiUtility.createJLabel(Messages.getString("String_Node_Str")));
  namePanel.add(mPieceNameField);
  mImageButton.setToolTipText(Messages.getString("String_Node_Str"));
  mImageButton.setPreferredSize(new Dimension(70,70));
  namePanel.add(mImageButton);
  JPanel allMovementsPanel=new JPanel();
  allMovementsPanel.setOpaque(false);
  allMovementsPanel.setLayout(new GridBagLayout());
  allMovementsPanel.setBorder(BorderFactory.createEmptyBorder(5,10,10,10));
  GridBagConstraints gbc=new GridBagConstraints();
  gbc.fill=GridBagConstraints.BOTH;
  gbc.weightx=1.0;
  gbc.weighty=1.0;
  gbc.gridwidth=3;
  allMovementsPanel.add(namePanel,gbc);
  dataStream().forEachOrdered(data -> {
    createScrollPane(allMovementsPanel,data.list,data.buttons,data.title);
    data.buttons.addAddActionListener(e -> data.showInputDialog.accept(false));
    data.buttons.addEditActionListener(e -> data.showInputDialog.accept(true));
    data.buttons.addRemoveActionListener(e -> data.model.remove(data.list.getSelectedIndex()));
    data.list.addListSelectionListener(e -> refreshButtonState(data));
  }
);
  JPanel boardPanels=new JPanel();
  boardPanels.setOpaque(false);
  boardPanels.setLayout(new BoxLayout(boardPanels,BoxLayout.LINE_AXIS));
  boardPanels.add(Box.createHorizontalGlue());
  boardPanels.add(mBoardPanel);
  boardPanels.add(Box.createHorizontalGlue());
  boardPanels.addComponentListener(new ComponentListener(){
    @Override public void componentResized(    ComponentEvent e){
      mBoardPanel.updateDimensions(e.getComponent().getWidth(),e.getComponent().getHeight());
    }
    @Override public void componentMoved(    ComponentEvent e){
    }
    @Override public void componentShown(    ComponentEvent e){
    }
    @Override public void componentHidden(    ComponentEvent e){
    }
  }
);
  JSplitPane splitPane=new JSplitPane(JSplitPane.VERTICAL_SPLIT,allMovementsPanel,boardPanels);
  splitPane.setPreferredSize(new Dimension(755,475));
  splitPane.setDividerLocation(230);
  splitPane.setOpaque(false);
  splitPane.setDividerSize(0);
  splitPane.setResizeWeight(0.3);
  splitPane.setEnabled(false);
  add(splitPane);
}