Re: [RFC] send-email: avoid duplicate In-Reply-To and References headers

[Eric Wong <e@80x24.org>]

Junio C Hamano <gitster@pobox.com> wrote:
> Eric Wong <e@80x24.org> writes:
> > When parsing an mbox, it is possible to get existing In-Reply-To
> > and References headers blindly appended into the headers of
> > message we generate.   This is probably the wrong thing to do
> > and we should prioritize what was given in the command-line,
> > cover letter, and previously-sent messages.
> >
> > One example I've noticed in the wild was:
> >
> > https://public-inbox.org/git/20161111124541.8216-17-vascomalmeida@sapo.pt/raw
> > ---
> >  I'm not completely sure this is what Vasco was doing in that
> >  message, so it's an RFC for now...
> 
> I think it is sensibleto give priority to the --in-reply-to option
> given from the command line over the in-file one.  I am not sure if
> we want to drop references, though.  Wouldn't it make more sense to
> just add what we got from the command line to what we read from the
> file?  I dunno.

You're right, existing References in the bodies should probably
be prepended to current ones, as their order should be
oldest-to-newest.

I'll wait on comments a bit and work on a better version w/ tests
next week.