code: function _addLineBreakBeforeAndAfter(node) {
      var doc             = node.ownerDocument,
          nextSibling     = _getNextSiblingThatIsNotBlank(node),
          previousSibling = _getPreviousSiblingThatIsNotBlank(node);
  
      if (nextSibling && !_isLineBreakOrBlockElement(nextSibling)) {
        node.parentNode.insertBefore(doc.createElement("br"), nextSibling);
      }
      if (previousSibling && !_isLineBreakOrBlockElement(previousSibling)) {
        node.parentNode.insertBefore(doc.createElement("br"), node);
      }
    }
docs: Adds line breaks before and after the given node if the previous and next siblings
  aren't already causing a visual line break (block element or <br>)