bug#36803: 27.0.50; Update mode-line of every window when compilation ends

[Eli Zaretskii]

> From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
> Date: Thu, 25 Jul 2019 15:37:37 +0200
> Cc: Lars Ingebrigtsen <larsi@gnus.org>, 36803@debbugs.gnu.org
> 
> > This seems to be a regression since Emacs 25, as it works for me upto and 
> > including Emacs 24.5.  So I think it would be nice to bisect to see which 
> > change caused this, before we decide how to fix it.
> >
> > Thanks
> 
> If my bisection is correct, then this regression dates back from
> 
>     645c8597e7f9fbc90ffe227d2be8ce383b0777ae
>     * src/process.c (status_notify): Avoid global redisplay (bug#11822)
>     
> http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=645c8597e7f9fbc90ffe227d2be8ce383b0777ae

Makes sense, I will look into why this change was made.

> I can't take an in-depth look at this commit right now (may do in a
> few hours); I am sending this in case the issue (and hopefully, the
> ideal fix) jumps out to you.

The very few first lines of the change are those which caused this,
the rest are just comment clarifications.