Escape blockquotes in the WYSIWYG

gistfile1.js

// escape blockquotes
if (
  selectedNode.children &&
  (lastNode = Array.prototype.slice.call(selectedNode['children'], -1)[0]).tagName == 'BR'
  && selectedNode.tagName == 'BLOCKQUOTE') {
    // remove previous break
    selectedNode.removeChild(lastNode);
    
    // attach to something new
    var invisibleSpace = document.createTextNode(wysihtml5.INVISIBLE_SPACE);
    dom.insert(invisibleSpace).after(selectedNode);
    composer.selection.selectNode(invisibleSpace);
    
    return event.preventDefault();
  }