private static boolean isLanguageExtension(@NotNull final PsiFile file, @NotNull final PsiElement elementAt) {
    final Language elementLanguage = elementAt.getLanguage();
    if (file.getLanguage() instanceof CompositeLanguage compositeLanguage) {
      final Language[] extensions = compositeLanguage.getLanguageExtensionsForFile(file);
      return ArrayUtil.contains(elementLanguage, extensions);
    }
    return false;
  }
private static boolean isLanguageExtension(@NotNull final PsiFile file, @NotNull final PsiElement elementAt)