@Override
    protected @NotNull List<LineFragment> computeFragments() {
      ProgressIndicator indicator = notNull(ProgressManager.getInstance().getProgressIndicator(), DumbProgressIndicator.INSTANCE);
      return ComparisonManager.getInstance().compareLines(myBeforeContent, myAfterContent, ComparisonPolicy.DEFAULT, indicator);
    }
@Override
    protected @NotNull List<LineFragment> computeFragments()