@Nullable
  private static List<Range> getChangedRangesFromBeforeRevision(@NotNull Document document, @NotNull Change change) {
    String contentFromVcs = getRevisionedContentFrom(change.getBeforeRevision());
    if (contentFromVcs == null) return null;

    return computeRanges(document, contentFromVcs);
  }
@Nullable
  private static List<Range> getChangedRangesFromBeforeRevision(@NotNull Document document, @NotNull Change change)