Program: 95532
Project: 95532
Buggy source:
/** 
 * Prompts the user if they really want to delete the given item.  If the user consents, the item is deleted. Otherwise, no action is taken.
 * @param toDelete The item to delete.
 * @param editor The editor in which the delete is taking place.
 * @return the parent of the element before its deletion, or <code>null</code> if no element is deleted.
 */
private Object deleteSingleElement(Object toDelete,ObjectMappingMultiPageEditor editor){
  boolean delete=false;
  Object lastParent=null;
  if (toDelete instanceof IObjectMappingAssoziationPO) {
    delete=MessageDialog.openConfirm(getActiveShell(),Messages.DeleteTreeItemActionOMEditorOMTitle,Messages.DeleteTreeItemActionOMEditorOMText1);
    if (delete) {
      lastParent=editor.getOmEditorBP().deleteAssociation((IObjectMappingAssoziationPO)toDelete);
      editor.getEditorHelper().setDirty(true);
      editor.cleanupNames();
    }
  }
 else   if (toDelete instanceof IComponentNamePO) {
    delete=MessageDialog.openConfirm(getActiveShell(),Messages.DeleteTreeItemActionOMEditorOMTitle,Messages.DeleteTreeItemActionOMEditorOMText2);
    if (delete) {
      lastParent=editor.getOmEditorBP().deleteCompName((IComponentNamePO)toDelete);
      editor.getEditorHelper().setDirty(true);
      editor.cleanupNames();
    }
  }
 else   if (toDelete instanceof IObjectMappingCategoryPO) {
    delete=MessageDialog.openConfirm(getActiveShell(),Messages.DeleteTreeItemActionOMEditorOMTitle,Messages.DeleteTreeItemActionOMEditorOMText4);
    if (delete) {
      lastParent=editor.getOmEditorBP().deleteCategory((IObjectMappingCategoryPO)toDelete);
      editor.getEditorHelper().setDirty(true);
      editor.cleanupNames();
    }
  }
  return lastParent;
}

Fixed version (ground truth):
/** 
 * Prompts the user if they really want to delete the given item.  If the user consents, the item is deleted. Otherwise, no action is taken.
 * @param toDelete The item to delete.
 * @param editor The editor in which the delete is taking place.
 * @return the parent of the element before its deletion, or <code>null</code> if no element is deleted.
 */
private Object deleteSingleElement(Object toDelete,ObjectMappingMultiPageEditor editor){
  boolean delete=false;
  Object lastParent=null;
  if (toDelete instanceof IObjectMappingAssoziationPO) {
    delete=MessageDialog.openConfirm(getActiveShell(),Messages.DeleteTreeItemActionOMEditorOMTitle,Messages.DeleteTreeItemActionOMEditorOMText1);
    if (delete) {
      lastParent=editor.getOmEditorBP().deleteAssociation((IObjectMappingAssoziationPO)toDelete);
      editor.getEditorHelper().setDirty(true);
      editor.cleanupNames();
      editor.synchronizeViewers();
    }
  }
 else   if (toDelete instanceof IComponentNamePO) {
    delete=MessageDialog.openConfirm(getActiveShell(),Messages.DeleteTreeItemActionOMEditorOMTitle,Messages.DeleteTreeItemActionOMEditorOMText2);
    if (delete) {
      lastParent=editor.getOmEditorBP().deleteCompName((IComponentNamePO)toDelete);
      editor.getEditorHelper().setDirty(true);
      editor.cleanupNames();
      editor.synchronizeViewers();
    }
  }
 else   if (toDelete instanceof IObjectMappingCategoryPO) {
    delete=MessageDialog.openConfirm(getActiveShell(),Messages.DeleteTreeItemActionOMEditorOMTitle,Messages.DeleteTreeItemActionOMEditorOMText4);
    if (delete) {
      lastParent=editor.getOmEditorBP().deleteCategory((IObjectMappingCategoryPO)toDelete);
      editor.getEditorHelper().setDirty(true);
      editor.cleanupNames();
      editor.synchronizeViewers();
    }
  }
  return lastParent;
}