bug#56682: feature/improved-locked-narrowing 9dee6df39c: Reworked locked narrowing.

[Eli Zaretskii]

> Date: Thu, 09 Feb 2023 01:57:50 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: monnier@iro.umontreal.ca, 56682@debbugs.gnu.org
> 
> 
> As promised, I worked on this.  Alas, while doing that I found out that 
> the existing code had a grave bug, which I corrected.  However, this 
> touches src/bytecode.c, lisp/emacs-lisp/bytecomp.el and src/comp.c, so I'm 
> (to say the least) uncomfortable pushing that fix to emacs-29.  The result 
> of the bug fix, a few renames, the documentation update, and an added 
> test, is in scratch/fix-locked-narrowing.  I did a make bootstrap and a 
> make check after each step, all of them succeeded.

Thanks.

Please describe the bug you discovered and the changes made to fix it
(and maybe also alternatives if you considered them).  It is not easy
to glean that information from the changes, as they involve also
renaming of variables (which, at this late stage, I don't think you
should have done without discussion, btw), documentation changes, and
perhaps more.

Also, did you test this both with and without native-compilation?

Andrea, could you please see if the changes on that branch are okay as
far as native-compilation is concerned?