anchor.diff:        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 += makeTd(makeDiffHelpIcon()); // Aligns withs glyph-id
  +    }
  +    html += makeTd(''); // Aligns with filename-td
       html += '</tr>';
       return html;
     };
  
positive.code:   // - - - - - - - - - - - - - - - - - - - - - - - -
    const nextEventIndex = (n) => {
      if (param.nowIndex === param.events.length-1) {
        return null; // disable
      } else {
        return n;
      }
  
negative.code:   // - - - - - - - - - - - - - - - - - - - - - - - -
    const prevEventIndex = (n) => {
      if (param.nowIndex === 1) { // 0 is creation event
        return null; // Disable
      } else {
        return n;
      }
  