Program: 21044
Project: 21044
Buggy source:
void showImage(final BackGroundImage bgio){
  new GuiRunnable<Object>(){
    public Object runSave(){
      final JPanel tmpPanel=new JPanel();
      final ImageComponent ic=new ImageComponent(bgio.getImage(manager.methode));
      tmpPanel.add(ic,BorderLayout.WEST);
      final JButton edit=new JButton(JDL.L("String_Node_Str","String_Node_Str"));
      final JButton del=new JButton(JDL.L("String_Node_Str","String_Node_Str"));
      edit.addActionListener(new ActionListener(){
        public void actionPerformed(        ActionEvent e){
          new GuiRunnable<Object>(){
            public Object runSave(){
              tmpPanel.remove(ic);
              tmpPanel.remove(edit);
              tmpPanel.remove(del);
              BackGroundImage dialogImage=bgio;
              manager.remove(bgio);
              tmpPanel.revalidate();
              mainDialog.pack();
              BackGroundImageDialog bgiaDialog=new BackGroundImageDialog(manager);
              bgiaDialog.dialogImage=dialogImage;
              dialogImage=bgiaDialog.getNewBackGroundImage();
              showImage(dialogImage);
              return null;
            }
          }
.waitForEDT();
        }
      }
);
      del.addActionListener(new ActionListener(){
        public void actionPerformed(        ActionEvent e){
          new GuiRunnable<Object>(){
            public Object runSave(){
              tmpPanel.remove(ic);
              tmpPanel.remove(del);
              tmpPanel.remove(edit);
              manager.remove(bgio);
              tmpPanel.revalidate();
              mainDialog.pack();
              return null;
            }
          }
.waitForEDT();
        }
      }
);
      tmpPanel.add(edit,BorderLayout.SOUTH);
      tmpPanel.add(del,BorderLayout.EAST);
      imageBox.add(tmpPanel);
      return null;
    }
  }
.waitForEDT();
}

Fixed version (ground truth):
void showImage(final BackGroundImage bgio){
  if (bgio == null)   return;
  new GuiRunnable<Object>(){
    public Object runSave(){
      final JPanel tmpPanel=new JPanel();
      final ImageComponent ic=new ImageComponent(bgio.getImage(manager.methode));
      tmpPanel.add(ic,BorderLayout.WEST);
      final JButton edit=new JButton(JDL.L("String_Node_Str","String_Node_Str"));
      final JButton del=new JButton(JDL.L("String_Node_Str","String_Node_Str"));
      edit.addActionListener(new ActionListener(){
        public void actionPerformed(        ActionEvent e){
          new GuiRunnable<Object>(){
            public Object runSave(){
              BackGroundImage dialogImage=bgio.clone();
              BackGroundImageDialog bgiaDialog=new BackGroundImageDialog(manager);
              bgiaDialog.dialogImage=dialogImage;
              dialogImage=bgiaDialog.getNewBackGroundImage();
              if (dialogImage != null) {
                if (!bgio.getBackgroundImage().equals(dialogImage.getBackgroundImage())) {
                  bgio.setBackgroundImage(dialogImage.getBackgroundImage());
                  ic.image=bgio.getImage(manager.methode);
                  ic.revalidate();
                  ic.repaint();
                }
                bgio.setColor(dialogImage.getColor());
                bgio.setColorDistanceMode(dialogImage.getColorDistanceMode());
                bgio.setDistance(dialogImage.getDistance());
              }
              return null;
            }
          }
.waitForEDT();
        }
      }
);
      del.addActionListener(new ActionListener(){
        public void actionPerformed(        ActionEvent e){
          new GuiRunnable<Object>(){
            public Object runSave(){
              tmpPanel.remove(ic);
              tmpPanel.remove(del);
              tmpPanel.remove(edit);
              manager.remove(bgio);
              tmpPanel.revalidate();
              mainDialog.pack();
              return null;
            }
          }
.waitForEDT();
        }
      }
);
      tmpPanel.add(edit,BorderLayout.SOUTH);
      tmpPanel.add(del,BorderLayout.EAST);
      imageBox.add(tmpPanel);
      return null;
    }
  }
.waitForEDT();
}