GNU bug report logs - #69563
29.1; message-forward-make-body-* has too long line

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: RwN <rwn <at> mailo.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.1; message-forward-make-body-* has too long line
Date: Tue, 05 Mar 2024 12:51:16 +0100

Both functions message-forward-make-body-digest-plain and 
message-forward-make-body-digest-plain has 68 long character length 
for the "start of forwarded line" while it has 66 for the "End" 
part. This cause a problem when format=flowed which use the 
recommended value 66 (RFC2046). Is there any reason the start line has 
2 characters more?

Best,
E.

InGNU Emacs 29.1 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, 
cairo version 1.16.0) of 2023-10-16 built onlaptop
Windowing system distributor 'The X.Org Foundation', 
version11.0.12101004
System Description:Ubuntu 22.04.4 LTS

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ 
JPEG JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES 
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF 
TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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 locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
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Memory information:
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(symbols 48 36648 37) (strings 32 202737 6575) (string-bytes 1 
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Message #8 received at 69563 <at> debbugs.gnu.org (full text, mbox):

From: Eric Abrahamsen <eric <at> ericabrahamsen.net>
To: 69563 <at> debbugs.gnu.org
Cc: RwN <rwn <at> mailo.com>
Subject: Re: bug#69563: 29.1; message-forward-make-body-* has too long line
Date: Wed, 06 Mar 2024 08:58:33 -0800

RwN via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs <at> gnu.org> writes:

> Both functions message-forward-make-body-digest-plain and
> message-forward-make-body-digest-plain has 68 long character length
> for the "start of forwarded line" while it has 66 for the "End" part.
> This cause a problem when format=flowed which use the recommended
> value 66 (RFC2046). Is there any reason the start line has 2
> characters more?

Thanks for the report. It looks to me like the relevant RFC is 3676[1],
which specifies lines SHOULD be 78 characters or shorter; 66 is only
mentioned as a "it has been suggested..." Is that not correct?

On the other hand, I can't think of a single good reason for the start
line to be 2 characters longer than the end line, except historical
accident.

[1]: https://datatracker.ietf.org/doc/html/rfc3676#section-4.2

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