anchor.diff:      $(`.diff-line-count[data-filename="${filename}"]`).attr('disabled', false);
     };
   
  -  const selectFilename = (id) => {
  +  const selectFilename = ($filename) => {
       $('.diff-filename', $reviewPage).removeClass('selected');
  -    $(`#radio_${id}`, $reviewPage).addClass('selected');
  +    $filename.addClass('selected');
     };
   
     const selectFile = (filename) => {
  
positive.code:       diff.section_index += 1;
        diff.section_index %= diff.section_count;
      }
    };
  
    // - - - - - - - - - - - - - - - - - - - - - - - -
  
negative.code:     $(`[id="${filename}_diff_div"]`).show();
    };
  
    const whenReClickedScrollToNextDiffChunk = (diff, filename) => {
      const firstClick = (filename) => !diff.clicked;
      const reClicked = (filename) => param.filename === filename;
      if (diff.section_count > 0 && (firstClick(filename) || reClicked(filename))) {
        const $diffSheet = $(`[id="diff_file_content_for_${filename}"]`);
  