protected static boolean isTagUnclosed(PsiElement lastChild) {
  //strange approach, but it's universal for xml and html
    return lastChild != null &&
           lastChild.getNode().getElementType() != XmlTokenType.XML_TAG_END &&
           lastChild.getNode().getElementType() != XmlTokenType.XML_EMPTY_ELEMENT_END;
  }
protected static boolean isTagUnclosed(PsiElement lastChild)