@Nullable
  private static PsiFile ensureValid(@NotNull PsiFile file) {
    if (file.isValid()) return file;

    VirtualFile virtualFile = file.getVirtualFile();
    if (!virtualFile.isValid()) return null;

    FileViewProvider provider = file.getManager().findViewProvider(virtualFile);
    if (provider == null) return null;

    Language language = file.getLanguage();
    return provider.hasLanguage(language) ? provider.getPsi(language) : provider.getPsi(provider.getBaseLanguage());
  }
@Nullable
  private static PsiFile ensureValid(@NotNull PsiFile file)