docs: public static ImmutableList<File> loadFileListRelativeTo(File fileList, File basePath)
        throws IOException {
      checkNotNull(basePath);
      final ImmutableList.Builder<File> ret = ImmutableList.builder();
  
      for (final String filename : Files.readLines(fileList, Charsets.UTF_8)) {
        if (!filename.isEmpty() && !isCommentLine(filename)) {
          ret.add(new File(basePath, filename.trim()));
        }
      }
  
      return ret.build();
    }