public static @Nullable IndentData min(@Nullable IndentData first, @Nullable IndentData second) {
    if (first == null) return second;
    if (second == null) return first;
    return first.getTotalSpaces() < second.getTotalSpaces() ? first : second;
  }
public static @Nullable IndentData min(@Nullable IndentData first, @Nullable IndentData second)