bug#61029: 28.2; post-command-hook error in nXML mode

[Eli Zaretskii]

> Cc: 61029@debbugs.gnu.org
> Date: Mon, 23 Jan 2023 17:42:51 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > From: Vincent Lefevre <vincent@vinc17.net>
> > Date: Mon, 23 Jan 2023 15:36:59 +0100
> > 
> > 
> > 1. Open the generated XML file with "emacs -Q".
> > 2. Type ESC > to go to the end of the file.
> > 3. Click on the space in the comment "<!-- -->".
> > 4. Insert a space.
> > 
> > I get the following error:
> > 
> > Error in post-command-hook (jit-lock--antiblink-post-command): 
> > (cl-assertion-failed (>= (cadr sgml--syntax-propertize-ppss) 0))
> 
> João, could you please look into this?

Actually, no: I see this problem in Emacs 28.2, but not in Emacs 29.
So I guess we have fixed this already.