Program: 104572
Project: 104572
Buggy source:
public Component getListCellRendererComponent(JList list,Object value,int index,boolean isSelected,boolean cellHasFocus){
  ContactList contactList=(ContactList)list;
  ContactListModel listModel=(ContactListModel)contactList.getModel();
  if (value instanceof MetaContact) {
    MetaContact contactItem=(MetaContact)value;
    String toolTipText="String_Node_Str" + contactItem.getDisplayName();
    this.nameLabel.setText(contactItem.getDisplayName());
    this.nameLabel.setIcon(listModel.getMetaContactStatusIcon(contactItem));
    this.nameLabel.setFont(this.getFont().deriveFont(Font.PLAIN));
    this.setBorder(BorderFactory.createEmptyBorder(1,1,1,1));
    this.setBounds(0,0,list.getWidth() - 2,17);
    this.buttonsPanel.removeAll();
    Iterator i=contactItem.getContacts();
    int buttonsPanelWidth=0;
    while (i.hasNext()) {
      Contact protocolContact=(Contact)i.next();
      String protocolName=protocolContact.getProtocolProvider().getProtocolName();
      Image protocolStatusIcon=(Image)Constants.getProtocolStatusIcons(protocolName).get(protocolContact.getPresenceStatus());
      ContactProtocolButton contactProtocolButton=new ContactProtocolButton(protocolStatusIcon,protocolStatusIcon);
      contactProtocolButton.setProtocolContact(protocolContact);
      contactProtocolButton.setSize(protocolStatusIcon.getWidth(null),protocolStatusIcon.getHeight(null));
      this.buttonsPanel.add(contactProtocolButton);
      buttonsPanelWidth+=contactProtocolButton.getWidth();
    }
    this.add(buttonsPanel,BorderLayout.EAST);
    toolTipText+="String_Node_Str";
    this.setToolTipText(toolTipText);
    this.isLeaf=true;
  }
 else   if (value instanceof MetaContactGroup) {
    MetaContactGroup groupItem=(MetaContactGroup)value;
    this.nameLabel.setText(groupItem.getGroupName());
    this.nameLabel.setIcon(new ImageIcon(ImageLoader.getImage(ImageLoader.GROUPS_16x16_ICON)));
    this.nameLabel.setFont(this.getFont().deriveFont(Font.BOLD));
    this.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));
    this.setBounds(0,0,list.getWidth() - 2,20);
    this.remove(buttonsPanel);
    this.isLeaf=false;
  }
  this.isSelected=isSelected;
  return this;
}

Fixed version (ground truth):
public Component getListCellRendererComponent(JList list,Object value,int index,boolean isSelected,boolean cellHasFocus){
  ContactList contactList=(ContactList)list;
  ContactListModel listModel=(ContactListModel)contactList.getModel();
  if (value instanceof MetaContact) {
    MetaContact contactItem=(MetaContact)value;
    String toolTipText="String_Node_Str" + contactItem.getDisplayName();
    this.nameLabel.setText(contactItem.getDisplayName());
    this.nameLabel.setIcon(listModel.getMetaContactStatusIcon(contactItem));
    this.nameLabel.setFont(this.getFont().deriveFont(Font.PLAIN));
    this.setBorder(BorderFactory.createEmptyBorder(1,1,1,1));
    this.setBounds(0,0,list.getWidth() - 2,17);
    this.buttonsPanel.removeAll();
    Iterator i=contactItem.getContacts();
    int buttonsPanelWidth=0;
    while (i.hasNext()) {
      Contact protocolContact=(Contact)i.next();
      String protocolName=protocolContact.getProtocolProvider().getProtocolName();
      Image protocolStatusIcon=(Image)Constants.getProtocolStatusIcons(protocolName).get(protocolContact.getPresenceStatus());
      ContactProtocolButton contactProtocolButton=new ContactProtocolButton(protocolStatusIcon,protocolStatusIcon);
      contactProtocolButton.setProtocolContact(protocolContact);
      contactProtocolButton.setSize(protocolStatusIcon.getWidth(null),protocolStatusIcon.getHeight(null));
      this.buttonsPanel.add(contactProtocolButton);
      buttonsPanelWidth+=contactProtocolButton.getWidth();
    }
    this.add(buttonsPanel,BorderLayout.EAST);
    toolTipText+="String_Node_Str";
    this.setToolTipText(toolTipText);
    this.isLeaf=true;
  }
 else   if (value instanceof MetaContactGroup) {
    MetaContactGroup groupItem=(MetaContactGroup)value;
    this.nameLabel.setText(groupItem.getGroupName() + "String_Node_Str" + groupItem.countChildContacts()+ "String_Node_Str");
    this.nameLabel.setIcon(new ImageIcon(ImageLoader.getImage(ImageLoader.GROUPS_16x16_ICON)));
    this.nameLabel.setFont(this.getFont().deriveFont(Font.BOLD));
    this.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));
    this.setBounds(0,0,list.getWidth() - 2,20);
    this.remove(buttonsPanel);
    this.isLeaf=false;
  }
  this.isSelected=isSelected;
  return this;
}