bug#33887: 26.1; Emacs hangs for several seconds when going to the end of an XML file in nXML mode

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Wed, 15 May 2019 19:53:08 -0400
> Cc: 33887@debbugs.gnu.org
> 
> Vincent Lefevre <vincent@vinc17.net> writes:
> 
> > This is a regression: Emacs 25 did not hang at all.
> 
> Should we backport Stefan's fix to emacs-26?  Or specifically, backport
> [1: e7e92dc5d2], which is Stefan's fix on top of my fix for the
> loss-of-single-quote-fontification bug (Bug#35381).
> 
> [1: e7e92dc5d2]: 2019-05-15 19:04:14 -0400
>   Fix merge of sgml-syntax-propertize-rules
>   
> https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=e7e92dc5d24ac3bcde69732bab6a6c3c0d9de97b

I'd like to leave this fix on master for a while, so that we could
make sure it has no adverse consequences.  Can we revisit this in a
month's time, say?