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

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Fri, 22 May 2020 13:16:04 +0200
> Cc: ture@turepalsson.se, 41445@debbugs.gnu.org
> 
> 22 maj 2020 kl. 13.11 skrev Eli Zaretskii <eliz@gnu.org>:
> 
> > Is that the right place to save-match-data, though?  Should we perhaps
> > do that where utf-8-hfs file names are encoded?
> 
> What location did you have in mind, more precisely?

I think in ucs-normalize-hfs-nfd-post-read-conversion and
ucs-normalize-hfs-nfd-pre-write-conversion.  IOW, so that this only
affects encoding and decoding macOS file names.  WDYT?