code: function focusToFirstCode($pre, wwe) {
    const range = wwe.getEditor().getSelection().cloneRange();
    $pre.removeClass(CODEBLOCK_CLASS_TEMP);
  
    range.setStartBefore($pre.get(0).firstChild);
    range.collapse(true);
  
    wwe.getEditor().setSelection(range);
  }
docs: focusToFirstCode
  Focus to first code tag content of pre tag
  @param {jQuery} $pre pre tag
  @param {WysiwygEditor} wwe wysiwygEditor