Re: vc-diff in non-VC buffer

[Richard Stallman]

    The above scenario to me has the following problem: when you say "go to
    a top-level project directory", this can mean to do it by opening some
    arbitrary file in that top-level dir or by opening the dir with dired or
    with vc-dired.

    Of those 3 cases, I think the first case should not be supported.  C-v x =
    from a file buffer should only apply to that file.  The third should of
    course be supported and the one I expect people to use.

    The second doesn't matter: if it works, it's harmless and if it doesn't it's
    not serious either because the user could have used vc-dired instead.
    But it should only work if the corresponding dir is under some kind of
    version control, of course.

I agree completely.