bug#22338: 25.0.50; deactivate-mark regression

[Leo Liu <sdl.web@gmail.com>]

On 2016-01-21 18:08 +0200, Eli Zaretskii wrote:
> Would you mind showing a more detailed recipe, including the file you
> used and the exact procedure to change the file behind Emacs's back?
> Also, how do you check that the mark is still active after the revert?
> I feel there are some fine details that are different between our
> attempts to reproduce the issue, because I cannot reproduce it no
> matter what I do.  There's some factor here that I don't get.  I hope
> it's not some stupid oversight on my part.

I am now using GNU Emacs 25.0.90 built on 2016-01-31 and the problem
seems getting better. My current observation is this (revert-buffer nil
t t) only keeps the active mark if the file has not changed at all but
deactivates it otherwise. I modified the file by appending a line to it
using shell command.

> Well, if we are talking about users, why would a user invoke
> revert-buffer in such a strange way?  And if the region is active, but
> not highlighted, doesn't "C-x C-x" show it highlighted?

Obviously not directly. It can be part of a hook. For example I am using
a package to refactor erlang which writes to disk and send emacs the
list of files that may have changed.

HTH,
Leo