bug#64391: buffer narrowing slowdown regression in emacs 29

[Eli Zaretskii]

> Date: Fri, 07 Jul 2023 10:31:01 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: acohen@ust.hk, 64391@debbugs.gnu.org, mattias.engdegard@gmail.com, 
>     monnier@iro.umontreal.ca, bugs@gnus.org
> 
> 
> >>> I have one question about the new `with-restriction` macro: if it is 
> >>> intended as a convenience macro for unlabelled narrowing as well, 
> >>> shouldn't it then expand to the obvious
> >>>
> >>>  (save-restriction
> >>>    (narrow-to-region BEG END)
> >>>    BODY)
> >>>
> >>> instead the much more expensive call to a helper function?
> >>
> >> Yes.  In fact now that we have a separate function for the labeled 
> >> case, we can remove the funcall in both cases.  Patch attached.
> >
> > You are killing me.
> >
> 
> ???  That wasn't meant for the release branch.

Then what is?