@Override
  public String getLineText(int line, Editor editor) {
    if (myTurnedOn) return "";
    final AnnotationSourceSwitcher switcher = myAnnotation.getAnnotationSourceSwitcher();
    if (switcher == null) return "";
    return switcher.mergeSourceAvailable(line) ? "M" : ""; //NON-NLS
  }
@Override
  public String getLineText(int line, Editor editor)