@Nullable
  private static PsiElement findNextAttribute(final XmlAttribute attribute) {
    PsiElement nextSibling = attribute.getNextSibling();
    while (nextSibling != null) {
      if (nextSibling instanceof XmlAttribute) return nextSibling;
      nextSibling = nextSibling.getNextSibling();
    }
    return null;
  }
@Nullable
  private static PsiElement findNextAttribute(final XmlAttribute attribute)