Program: 32490
Project: 32490
Buggy source:
/** 
 * This private constructor creates an AutoCompleteSupport object which adds autocompletion functionality to the given <code>comboBox</code>. In particular, a custom   {@link ComboBoxModel} is installed behind the<code>comboBox</code> containing the given <code>items</code>. The <code>filterator</code> is consulted in order to extract searchable text from each of the <code>items</code>. Non-null <code>format</code> objects are used to convert ComboBoxModel elements to Strings and back again for various functions like filtering, editing, and rendering.
 * @param comboBox the {@link JComboBox} to decorate with autocompletion
 * @param items the objects to display in the <code>comboBox</code>
 * @param filterator extracts searchable text strings from each item
 * @param format converts combobox elements into strings and vice versa
 */
private AutoCompleteSupport(JComboBox comboBox,EventList<E> items,TextFilterator<? super E> filterator,Format format){
  this.comboBox=comboBox;
  this.originalComboBoxEditable=comboBox.isEditable();
  this.originalModel=comboBox.getModel();
  this.items=items;
  this.format=format;
  final boolean defaultRendererInstalled=comboBox.getEditor() instanceof UIResource;
  this.renderer=format != null && defaultRendererInstalled ? new StringFunctionRenderer() : null;
  this.isTableCellEditor=Boolean.TRUE.equals(comboBox.getClientProperty("String_Node_Str"));
  this.doNotTogglePopup=!isTableCellEditor;
  items.getReadWriteLock().readLock().lock();
  try {
    this.filterMatcherEditor=new TextMatcherEditor(filterator == null ? new DefaultTextFilterator() : filterator);
    this.filterMatcherEditor.setMode(TextMatcherEditor.STARTS_WITH);
    this.filteredItems=new FilterList<E>(items,this.filterMatcherEditor);
    this.firstItem=new BasicEventList<E>(items.getPublisher(),items.getReadWriteLock());
    this.allItemsFiltered=new CompositeList<E>(items.getPublisher(),items.getReadWriteLock());
    this.allItemsFiltered.addMemberList(this.firstItem);
    this.allItemsFiltered.addMemberList(this.filteredItems);
    this.comboBoxModel=new AutoCompleteComboBoxModel(this.allItemsFiltered);
    this.allItemsUnfiltered=new CompositeList<E>(items.getPublisher(),items.getReadWriteLock());
    this.allItemsUnfiltered.addMemberList(this.firstItem);
    this.allItemsUnfiltered.addMemberList(this.items);
  }
  finally {
    items.getReadWriteLock().readLock().unlock();
  }
  this.comboBox.setModel(this.comboBoxModel);
  this.comboBox.setEditable(true);
  decorateCurrentUI();
  this.comboBox.addPropertyChangeListener("String_Node_Str",this.uiWatcher);
  this.comboBox.addPropertyChangeListener("String_Node_Str",this.modelWatcher);
  this.comboBoxEditorComponent.addPropertyChangeListener("String_Node_Str",this.documentWatcher);
}

Fixed version (ground truth):
/** 
 * This private constructor creates an AutoCompleteSupport object which adds autocompletion functionality to the given <code>comboBox</code>. In particular, a custom   {@link ComboBoxModel} is installed behind the<code>comboBox</code> containing the given <code>items</code>. The <code>filterator</code> is consulted in order to extract searchable text from each of the <code>items</code>. Non-null <code>format</code> objects are used to convert ComboBoxModel elements to Strings and back again for various functions like filtering, editing, and rendering.
 * @param comboBox the {@link JComboBox} to decorate with autocompletion
 * @param items the objects to display in the <code>comboBox</code>
 * @param filterator extracts searchable text strings from each item
 * @param format converts combobox elements into strings and vice versa
 */
private AutoCompleteSupport(JComboBox comboBox,EventList<E> items,TextFilterator<? super E> filterator,Format format){
  this.comboBox=comboBox;
  this.originalComboBoxEditable=comboBox.isEditable();
  this.originalModel=comboBox.getModel();
  this.items=items;
  this.format=format;
  final boolean defaultRendererInstalled=comboBox.getRenderer() instanceof UIResource;
  this.renderer=format != null && defaultRendererInstalled ? new StringFunctionRenderer() : null;
  this.isTableCellEditor=Boolean.TRUE.equals(comboBox.getClientProperty("String_Node_Str"));
  this.doNotTogglePopup=!isTableCellEditor;
  items.getReadWriteLock().readLock().lock();
  try {
    this.filterMatcherEditor=new TextMatcherEditor(filterator == null ? new DefaultTextFilterator() : filterator);
    this.filterMatcherEditor.setMode(TextMatcherEditor.STARTS_WITH);
    this.filteredItems=new FilterList<E>(items,this.filterMatcherEditor);
    this.firstItem=new BasicEventList<E>(items.getPublisher(),items.getReadWriteLock());
    this.allItemsFiltered=new CompositeList<E>(items.getPublisher(),items.getReadWriteLock());
    this.allItemsFiltered.addMemberList(this.firstItem);
    this.allItemsFiltered.addMemberList(this.filteredItems);
    this.comboBoxModel=new AutoCompleteComboBoxModel(this.allItemsFiltered);
    this.allItemsUnfiltered=new CompositeList<E>(items.getPublisher(),items.getReadWriteLock());
    this.allItemsUnfiltered.addMemberList(this.firstItem);
    this.allItemsUnfiltered.addMemberList(this.items);
  }
  finally {
    items.getReadWriteLock().readLock().unlock();
  }
  this.comboBox.setModel(this.comboBoxModel);
  this.comboBox.setEditable(true);
  decorateCurrentUI();
  this.comboBox.addPropertyChangeListener("String_Node_Str",this.uiWatcher);
  this.comboBox.addPropertyChangeListener("String_Node_Str",this.modelWatcher);
  this.comboBoxEditorComponent.addPropertyChangeListener("String_Node_Str",this.documentWatcher);
}