static @Nullable PsiElement findClosingToken(XmlTag tag) {
    PsiElement[] children = tag.getChildren();
    for (int i = 0; i < children.length; i++) {
      PsiElement element = children[i];
      if (element instanceof XmlToken token) {
        IElementType type = token.getTokenType();
        if (type.equals(XmlTokenType.XML_TAG_END)) {
          return children[i + 1];
        }
      }
    }
    return null;
  }
static @Nullable PsiElement findClosingToken(XmlTag tag)