anchor.diff:        const tag = $(this).data('tag');
         $(this)
           .attr('title', toolTip(index))
  -        .click(function() { show(tag); });
  +        .click(() => { show(tag); });
       });
     };
   
  
positive.code:   // - - - - - - - - - - - - - - - - - - - - - - - -
  
    const reviewRefresh = () => {
      $('.ui-dialog').addClass('busy');
      const params = {
              id: param.id,
          avatar: param.avatar,
         was_tag: param.wasTag,
         now_tag: param.nowTag,
        filename: param.filename
      };
      $.getJSON('/differ/diff', params, (reviewParam) => {
        $('.ui-dialog').removeClass('busy');
        param = reviewParam;
        refreshDiffCheckBox();
        refreshTrafficLights();
        refreshAvatarControls();
  
negative.code:   // Everywhere else review is its own *page* with its own URL.
    // The [revert] button is available only from the review *dialog*.
    //---------------------------------------------------------------------
  
    let param = {
            id: "<%= @kata.id %>",
        avatar: "<%= @avatar.name %>",
        wasTag: "<%= @was_tag %>",
        nowTag: "<%= @now_tag %>",
      filename: "<%= @filename %>"
    };
  
    cd.setReviewDialogData = (id, avatar, wasTag, nowTag, filename) => {
      param = {
  