@RequiresEdt
  protected void installHighlighters() {
    assert myHighlighters.isEmpty();

    createHighlighter(ThreeSide.BASE);
    if (isChange(Side.LEFT)) createHighlighter(ThreeSide.LEFT);
    if (isChange(Side.RIGHT)) createHighlighter(ThreeSide.RIGHT);
  }
@RequiresEdt
  protected void installHighlighters()