anchor.diff:    // - - - - - - - - - - - - - - - - - - - - - - - -
     cd.setReviewData = (version, id, groupId, avatarIndex, wasIndex, nowIndex) => {
       // Called only from app/views/kata/_traffic_lights.html.erb
  -    // The [resume] & [checkout] buttons are only shown on kata/edit. [1]
       review.params = {
             version:version,
                  id:id,
  
positive.code:          wasIndex:wasIndex,
           nowIndex:nowIndex
      };
      fadeIntoReviewPage();
      review.setupButton('checkout', () => review.fadeIntoKataPage(() => { // [1]
        cd.checkout({ src_id:review.params.id, src_index:review.params.nowIndex });
      }));
      setCheckoutButtonTip();
      review.refresh();
    };
  
    // - - - - - - - - - - - - - - - - - - - - - - - -
    const fadeIntoReviewPage = () => {
      $kataPage.fadeOut('fast', () => {
        review.page.fadeIn('fast');
      });
  
negative.code:   };
  
    // - - - - - - - - - - - - - - - - - - - - - - - -
    review.setupButton = (name, handler) => {
      const button = `<button id="${name}-button" type="button"></button>`;
      $(`#${name}-button-box`).html(button);
  