static @NotNull Result thisFile(@NotNull PsiFileSystemItem file) {
    ThreadingAssertions.assertEventDispatchThread();
    Project project = file.getProject();
    VirtualFile virtualFile = file.getVirtualFile();
    if (virtualFile == null) {
      return Result.UH_UH;
    }
    if (file instanceof PsiCodeFragment) {
      return Result.UH_HUH;
    }
    if (ScratchUtil.isScratch(virtualFile)) {
      return canUndo(virtualFile, project) ? Result.UH_HUH : Result.UH_UH;
    }
    return canUndo(virtualFile, project) ? Result.ONLY_WHEN_IN_CONTENT : Result.UH_UH;
  }
static @NotNull Result thisFile(@NotNull PsiFileSystemItem file)