bug#31073: 27.0.50; query-replace undo might change the word case

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> Cc: juri@jurta.org,  31073@debbugs.gnu.org
> Date: Sun, 08 Apr 2018 11:46:15 +0900
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> this feature was introduced for Emacs-26 release.  Should the fix go
> >> into that branch (Emacs-26)?
> >
> > It's too late for Emacs 26.1.  For the other 26.x, I'd need to see the
> > patch first.
> I see.
> The patch is pretty obvious: just 1 line:

Thanks.  This is indeed OK for the emacs-26 branch, but please wait
with pushing this until Emacs 26.1 is released, hopefully soon enough.

Alternatively, feel free to push to master and cherry-pick to emacs-26
later, after the 26.1 release.