bug#11757: Acknowledgement (24.1.50; vc-git calls `process-file' too many times)

[Stefan Monnier]

> This won't happen in following cases:
> 1) We switch to revision when the opened file is the same.
> 2) It doesn't exist there.
> 3) We just delete it from disk from outside of Emacs.
> So the file isn't changed, and you see no warning or update, even after you
> write it to disk from Emacs again.

While that is suboptimal, VC's state is often suboptimal like that.
The only cases where VC's state is (or at least really should)
up-to-date is:
- when it was changed by an explicit VC action.
- when we need to know the state in order to make an important decision.
Updating the state in other circumstances is good, but not necessary.
Improving VC so that the first case is more frequent would actually
be preferable.


        Stefan