Re: BUG?: The UI shows an "In-Reply-To" value different than the actual value

[Leah Neukirchen <leah@vuxu.org>]

Eric Wong <e@80x24.org> writes:

> When I was working on this, I found References: more consistent
> and easier-to-parse than In-Reply-To; as the latter could
> contain random human-readable phrases.  Thus the code favors
> using the References header for threading.
>
> lib/PublicInbox/MID.pm has this, currently:
>
> 	# last References should be IRT, but some mail clients do things
> 	# out of order, so trust IRT over References iff IRT exists

This is also what jwz recommends (https://www.jwz.org/doc/threading.html):

>> I've been informed that recent versions of Eudora violate this
>> standard: they put the parent Message-ID in the In-Reply-To header,
>> but do not duplicate it in the References header: instead, the
>> References header contains the grandparent, great-grand-parent,
>> etc.
>> This implies that to properly reconstruct the thread of a message
>> in the face of this nonstandard behavior, we need to append any
>> In-Reply-To message IDs to References.

(mthread(1) of mblaze does the same.)

-- 
Leah Neukirchen  <leah@vuxu.org>  http://leah.zone