anchor.diff:      // Builds click handlers for all filenames for a given
       // [ kata-id, was-index, now-index] tuple.
       // When you open a new filename it auto-scrolls its first diff-chunk.
  -    // When you reclick a filename it auto-scrolls to its *next* diff-chunk.
  +    // When you reclick a filename it auto-scrolls to its next diff-chunk.
       const getFilename = (node) => $.trim(node.text());
       const id = (name) => $(`[id="${name}"]`);
       const diffFileContentFor = (filename) => id(`diff_file_content_for_${filename}`);
  
positive.code:   };
  
    const makeDiffCount = (lineCount, diff, cssName) => {
      if (!inDiffMode()) {
        return '';
      }
      const div = $('<div>', {
        'class': `diff-${cssName}-line-count`,
        'data-filename': diff.filename
  
negative.code:   };
  
    const makeDiffLineCountIcon = (cssName, icon) => {
      if (!inDiffMode()) { return ''; }
      return `<div class="diff-${cssName}-line-count-icon">${icon}</div>`;
    };
  
    const makeDiffDeletedCount = (lineCount, diff) => {
  