Re: Make Message more RFC compliant

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Fri, 13 Apr 2018 23:27:17 +0200
> 
> >>    Note: Some legacy implementations used the simple form where the
> >>    addr-spec appears without the angle brackets, but included the name
> >>    of the recipient in parentheses as a comment following the addr-spec.
> >>    Since the meaning of the information in a comment is unspecified,
> >>    implementations SHOULD use the full name-addr form of the mailbox,
> >>    instead of the legacy form, to specify the display name associated
> >>    with a mailbox.
> 
> So:
> 
> The RFC says SHOULD, so Message shouldn't have an easy way to generate
> >From headers that deviate from the `angles' style.
> 
> So I propose to remove the code that reacts to `message-from-style'
> (i.e., always generate `angles' From headers), and mark
> `message-from-style' as obsolete and note in the doc string that it's no
> longer used.
> 
> Any objections?

I don't understand why we need to remove the support code.  Making the
variable obsolete is OK, but if there's someone out there whose bad
habits die hard, or who needs to communicate with some weirdo mail
software that requires this obsolete format, why not let them do it?

Or am I missing something?