@Nullable
  @Override
  protected Iterable<? extends Crumb> computeCrumbs(int offset) {
    FileBreadcrumbsCollector collector = findCollector(myFile);
    if (collector == null) return null;

    Document document = myEditor.getDocument();
    return collector.computeCrumbs(myFile, document, offset, null);
  }
@Nullable
  @Override
  protected Iterable<? extends Crumb> computeCrumbs(int offset)