public static @NotNull IndexableFilesDeduplicateFilter createDelegatingTo(@NotNull IndexableFilesDeduplicateFilter delegate) {
    if (delegate.myDelegate != null) {
      throw new IllegalStateException("Only one-level delegation is supported now");
    }
    return new IndexableFilesDeduplicateFilter(delegate);
  }
public static @NotNull IndexableFilesDeduplicateFilter createDelegatingTo(@NotNull IndexableFilesDeduplicateFilter delegate)