bug#45631: 27.1; regression: message-forward-ignored-headers no longer applies when forwarding as MIME

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Sun, 10 Jan 2021 16:18:23 +0100
> Cc: 45631@debbugs.gnu.org, Daniel Kahn Gillmor <dkg@fifthhorseman.net>
> 
> Robert Pluim <rpluim@gmail.com> writes:
> 
> > I think setting message-forward-show-mml to t will do what you want,
> > then message won't bother to check if the message is signed/encrypted,
> > and will thus apply message-forward-ignored-headers.
> 
> Looking over that mess again, I think my analysis of when that variable
> is used, and when it's supposed to be used, was wrong.  I've now make it
> respect that variable even if message-forward-show-mml is nil.

Should this be fixed on the emacs-27 branch?