bug#47616: 27.1; hardening mail-envelope-from

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Fri, 07 May 2021 13:17:27 +0200
> Cc: 47616@debbugs.gnu.org
> 
> Francesco Potortì <pot@gnu.org> writes:
> 
> > That makes sense, in principle.  I would argue for adding a comment to
> > mail-envelope-from stating that since it calls mail-fetch-field it
> > should be called only after narrowing to the headers.  Or maybe even
> > adding a note in the doc string, as done in mail-fetch-field.
> 
> Good idea.  I've now mentioned this in the doc string in Emacs 28.

Did you forget to push?