Program: 78806
Project: 78806
Buggy source:
/** 
 * Creates the field area
 * @param parent the parent composite
 */
private void createFieldArea(Composite parent){
  Composite composite=new Composite(parent,SWT.NONE);
  composite.setLayout(new GridLayout());
  GridData gd=new GridData(GridData.FILL_BOTH);
  gd.widthHint=200;
  composite.setLayoutData(gd);
  new Label(composite,SWT.NONE).setText(GROUP_DLG_GROUP_NAME_LABEL);
  nameEditor=new Text(composite,SWT.SINGLE | SWT.BORDER);
  nameEditor.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  new Label(composite,SWT.NONE).setText(GROUP_DLG_GROUP_KEY_LABEL);
  keyChooser=new Combo(composite,SWT.DROP_DOWN);
  keyChooser.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  keyChooser.addModifyListener(new ModifyListener(){
    public void modifyText(    ModifyEvent e){
      getOkButton().setEnabled(keyChooser.getText().length() > 0);
    }
  }
);
  Composite intervalArea=new Composite(composite,SWT.NONE);
  intervalArea.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  intervalArea.setLayout(UIUtil.createGridLayoutWithoutMargin(2,false));
  new Label(intervalArea,SWT.NONE).setText(GROUP_DLG_GROUP_INTERVAL_LABEL);
  new Label(intervalArea,SWT.NONE).setText(GROUP_DLG_GROUP_RANGE_LABEL);
  intervalType=new Combo(intervalArea,SWT.READ_ONLY | SWT.DROP_DOWN);
  intervalType.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  for (int i=0; i < intervalChoices.length; i++) {
    intervalType.add(intervalChoices[i].getDisplayName());
  }
  intervalType.setData(intervalChoices);
  intervalType.addSelectionListener(new SelectionAdapter(){
    public void widgetSelected(    SelectionEvent e){
      intervalRange.setEnabled(intervalType.getSelectionIndex() != 0);
    }
  }
);
  intervalRange=new Spinner(intervalArea,SWT.NONE);
  intervalRange.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
  intervalRange.setMinimum(0);
  intervalRange.setMaximum(Integer.MAX_VALUE);
  intervalRange.setStep(1);
}

Fixed version (ground truth):
/** 
 * Creates the field area
 * @param parent the parent composite
 */
private void createFieldArea(Composite parent){
  Composite composite=new Composite(parent,SWT.NONE);
  composite.setLayout(new GridLayout());
  GridData gd=new GridData(GridData.FILL_BOTH);
  gd.widthHint=200;
  composite.setLayoutData(gd);
  new Label(composite,SWT.NONE).setText(GROUP_DLG_GROUP_NAME_LABEL);
  nameEditor=new Text(composite,SWT.SINGLE | SWT.BORDER);
  nameEditor.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  new Label(composite,SWT.NONE).setText(GROUP_DLG_GROUP_KEY_LABEL);
  keyChooser=new Combo(composite,SWT.DROP_DOWN);
  keyChooser.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  Composite intervalArea=new Composite(composite,SWT.NONE);
  intervalArea.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  intervalArea.setLayout(UIUtil.createGridLayoutWithoutMargin(2,false));
  new Label(intervalArea,SWT.NONE).setText(GROUP_DLG_GROUP_INTERVAL_LABEL);
  new Label(intervalArea,SWT.NONE).setText(GROUP_DLG_GROUP_RANGE_LABEL);
  intervalType=new Combo(intervalArea,SWT.READ_ONLY | SWT.DROP_DOWN);
  intervalType.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  for (int i=0; i < intervalChoices.length; i++) {
    intervalType.add(intervalChoices[i].getDisplayName());
  }
  intervalType.setData(intervalChoices);
  intervalType.addSelectionListener(new SelectionAdapter(){
    public void widgetSelected(    SelectionEvent e){
      intervalRange.setEnabled(intervalType.getSelectionIndex() != 0);
    }
  }
);
  intervalRange=new Spinner(intervalArea,SWT.NONE);
  intervalRange.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
  intervalRange.setMinimum(0);
  intervalRange.setMaximum(Integer.MAX_VALUE);
  intervalRange.setStep(1);
}