Program: 80667
Project: 80667
Buggy source:
ThreadDetails(final ComponentUtils.ModalPopup popup,KonThread thread){
  mThread=thread;
  GroupPanel groupPanel=new GroupPanel(View.GAP_BIG,false);
  groupPanel.setMargin(View.MARGIN_BIG);
  groupPanel.add(new WebLabel(Tr.tr("String_Node_Str")).setBoldFont());
  groupPanel.add(new WebSeparator(true,true));
  groupPanel.add(new WebLabel(Tr.tr("String_Node_Str")));
  String subj=mThread.getSubject();
  mSubjectField=new WebTextField(subj,22);
  mSubjectField.setInputPrompt(subj);
  mSubjectField.setHideInputPromptOnFocus(false);
  groupPanel.add(mSubjectField);
  groupPanel.add(new WebSeparator(true,true));
  final WebSlider colorSlider=new WebSlider(WebSlider.HORIZONTAL);
  groupPanel.add(new WebLabel(Tr.tr("String_Node_Str")));
  mColorOpt=new WebRadioButton(Tr.tr("String_Node_Str") + "String_Node_Str");
  Optional<Color> optBGColor=mThread.getViewSettings().getBGColor();
  mColorOpt.setSelected(optBGColor.isPresent());
  mColorOpt.addItemListener(new ItemListener(){
    @Override public void itemStateChanged(    ItemEvent e){
      colorSlider.setEnabled(e.getStateChange() == ItemEvent.SELECTED);
    }
  }
);
  mColor=new WebButton();
  mColor.setMinimumHeight(25);
  Color oldColor=optBGColor.orElse(DEFAULT_BG);
  mColor.setBottomBgColor(oldColor);
  groupPanel.add(new GroupPanel(GroupingType.fillLast,mColorOpt,mColor));
  colorSlider.setMinimum(0);
  colorSlider.setMaximum(100);
  colorSlider.setPaintTicks(false);
  colorSlider.setPaintLabels(false);
  colorSlider.setEnabled(optBGColor.isPresent());
  final GradientData gradientData=GradientData.getDefaultValue();
  gradientData.getColor(0);
  colorSlider.addChangeListener(new ChangeListener(){
    @Override public void stateChanged(    ChangeEvent e){
      float v=colorSlider.getValue() / (float)100;
      Color c=gradientData.getColorForLocation(v);
      mColor.setBottomBgColor(c);
      mColor.repaint();
    }
  }
);
  groupPanel.add(colorSlider);
  mImgOpt=new WebRadioButton(Tr.tr("String_Node_Str") + "String_Node_Str");
  String imgPath=mThread.getViewSettings().getImagePath();
  mImgOpt.setSelected(!imgPath.isEmpty());
  mImgOpt.addItemListener(new ItemListener(){
    @Override public void itemStateChanged(    ItemEvent e){
      mImgChooser.setEnabled(e.getStateChange() == ItemEvent.SELECTED);
      mImgChooser.getChooseButton().setEnabled(e.getStateChange() == ItemEvent.SELECTED);
    }
  }
);
  mImgChooser=Utils.createImageChooser(!imgPath.isEmpty(),imgPath);
  groupPanel.add(new GroupPanel(GroupingType.fillLast,mImgOpt,mImgChooser));
  UnselectableButtonGroup.group(mColorOpt,mImgOpt);
  groupPanel.add(new WebSeparator());
  final WebButton saveButton=new WebButton(Tr.tr("String_Node_Str"));
  this.add(groupPanel,BorderLayout.CENTER);
  saveButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      ThreadDetails.this.save();
      popup.close();
    }
  }
);
  GroupPanel buttonPanel=new GroupPanel(2,saveButton);
  buttonPanel.setLayout(new FlowLayout(FlowLayout.TRAILING));
  this.add(buttonPanel,BorderLayout.SOUTH);
}

Fixed version (ground truth):
ThreadDetails(final ComponentUtils.ModalPopup popup,KonThread thread){
  mThread=thread;
  GroupPanel groupPanel=new GroupPanel(View.GAP_BIG,false);
  groupPanel.setMargin(View.MARGIN_BIG);
  groupPanel.add(new WebLabel(Tr.tr("String_Node_Str")).setBoldFont());
  groupPanel.add(new WebSeparator(true,true));
  groupPanel.add(new WebLabel(Tr.tr("String_Node_Str")));
  String subj=mThread.getSubject();
  mSubjectField=new WebTextField(subj,22);
  mSubjectField.setInputPrompt(subj);
  mSubjectField.setHideInputPromptOnFocus(false);
  groupPanel.add(mSubjectField);
  groupPanel.add(new WebSeparator(true,true));
  final WebSlider colorSlider=new WebSlider(WebSlider.HORIZONTAL);
  groupPanel.add(new WebLabel(Tr.tr("String_Node_Str")));
  mColorOpt=new WebRadioButton(Tr.tr("String_Node_Str") + "String_Node_Str");
  Optional<Color> optBGColor=mThread.getViewSettings().getBGColor();
  mColorOpt.setSelected(optBGColor.isPresent());
  mColorOpt.addItemListener(new ItemListener(){
    @Override public void itemStateChanged(    ItemEvent e){
      colorSlider.setEnabled(e.getStateChange() == ItemEvent.SELECTED);
    }
  }
);
  mColor=new WebButton();
  mColor.setMinimumHeight(25);
  Color oldColor=optBGColor.orElse(DEFAULT_BG);
  mColor.setBottomBgColor(oldColor);
  groupPanel.add(new GroupPanel(GroupingType.fillLast,mColorOpt,mColor));
  colorSlider.setMinimum(0);
  colorSlider.setMaximum(100);
  colorSlider.setPaintTicks(false);
  colorSlider.setPaintLabels(false);
  colorSlider.setEnabled(optBGColor.isPresent());
  final GradientData gradientData=GradientData.getDefaultValue();
  gradientData.getColor(0);
  colorSlider.addChangeListener(new ChangeListener(){
    @Override public void stateChanged(    ChangeEvent e){
      float v=colorSlider.getValue() / (float)100;
      Color c=gradientData.getColorForLocation(v);
      mColor.setBottomBgColor(c);
      mColor.repaint();
    }
  }
);
  groupPanel.add(colorSlider);
  mImgOpt=new WebRadioButton(Tr.tr("String_Node_Str") + "String_Node_Str");
  String imgPath=mThread.getViewSettings().getImagePath();
  mImgOpt.setSelected(!imgPath.isEmpty());
  mImgOpt.addItemListener(new ItemListener(){
    @Override public void itemStateChanged(    ItemEvent e){
      mImgChooser.setEnabled(e.getStateChange() == ItemEvent.SELECTED);
      mImgChooser.getChooseButton().setEnabled(e.getStateChange() == ItemEvent.SELECTED);
    }
  }
);
  mImgChooser=Utils.createImageChooser(!imgPath.isEmpty(),imgPath);
  mImgChooser.setPreferredWidth(1);
  groupPanel.add(new GroupPanel(GroupingType.fillLast,mImgOpt,mImgChooser));
  UnselectableButtonGroup.group(mColorOpt,mImgOpt);
  groupPanel.add(new WebSeparator());
  final WebButton saveButton=new WebButton(Tr.tr("String_Node_Str"));
  this.add(groupPanel,BorderLayout.CENTER);
  saveButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      ThreadDetails.this.save();
      popup.close();
    }
  }
);
  GroupPanel buttonPanel=new GroupPanel(2,saveButton);
  buttonPanel.setLayout(new FlowLayout(FlowLayout.TRAILING));
  this.add(buttonPanel,BorderLayout.SOUTH);
}