code: function elementBoundaryEval( node )
  	{
  		// Reject any text node unless it's being bookmark
  		// OR it's spaces. (#3883)
  		return node.type != CKEDITOR.NODE_TEXT
  			    && node.getName() in CKEDITOR.dtd.$removeEmpty
  			    || !CKEDITOR.tools.trim( node.getText() )
  			    || !!node.getParent().data( 'cke-bookmark' );
  	}
docs: Evaluator for CKEDITOR.dom.element::checkBoundaryOfElement, reject any text node and non-empty elements unless it's being bookmark text.