anchor.diff:  
     // - - - - - - - - - - - - - - - - - - - - - - - -
     const sortedDiffs = (diffs) => {
  -    // ensure filenames appear in the same order as kata/edit page
  +    // Ensure filenames appear in the same order as kata/edit page
       const filenames = diffs.map(diff => diffFilename(diff));
       const sorted = cd.sortedFilenames(filenames);
       const diffFor = (filename) => diffs.find(diff => diffFilename(diff) === filename);
  
positive.code:   // - - - - - - - - - - - - - - - - - - - - - - - -
    const prevEventIndex = (n) => {
      if (param.nowIndex === 1) { // 0 is creation event
        return null; // disable
      } else {
        return n;
      }
  
negative.code:       html += makeTd(makeDiffLineCountIcon('deleted', '&mdash;'));
        html += makeTd(makeDiffLineCountIcon('added', '+'));
        html += makeTd(makeDiffLineCountIcon('same', '='));
        html += makeTd(makeDiffHelpIcon()); // Aligns withs glyph-id
      }
      html += makeTd(''); // Aligns with filename-td
      html += '</tr>';
      return html;
    };
  