bug#41445: 26.3; Query-replace triggers "match data clobbered by..."

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sat, 23 May 2020 14:37:17 +0200
> Cc: Mattias Engdegård <mattiase@acm.org>, 
>       Stefan Monnier <monnier@iro.umontreal.ca>, ture@turepalsson.se, 
> 41445@debbugs.gnu.org
> 
> > I thought we had some advice to Lisp programs not to assume that
> > match-data will be preserved, but maybe I'm misremembering.  Stefan,
> > do you remember something along these lines?
> 
> That's at least what the manual says
> (https://www.gnu.org/software/emacs/manual/html_node/elisp/Match-Data.html):
> "Notice that all functions are allowed to overwrite the match data
> unless they're explicitly documented not to do so."
> (Not that I like that statement, but it is current reality.)

Right, thanks.  I missed that.