public void installHighlighter(@Nullable SimpleDiffChange previousChange) {
    assert myHighlighters.isEmpty() && myOperations.isEmpty();

    createHighlighter(Side.LEFT);
    createHighlighter(Side.RIGHT);

    List<DiffFragment> innerFragments = myChange.getFragment().getInnerFragments();
    for (DiffFragment fragment : ContainerUtil.notNullize(innerFragments)) {
      createInlineHighlighter(fragment, Side.LEFT);
      createInlineHighlighter(fragment, Side.RIGHT);
    }

    createNonSquashedChangesSeparator(previousChange, Side.LEFT);
    createNonSquashedChangesSeparator(previousChange, Side.RIGHT);

    doInstallActionHighlighters();
  }
public void installHighlighter(@Nullable SimpleDiffChange previousChange)