[Users] "Thread using subject in addition to standard headers" not working?

[Thomas Leitner]

On 2021-01-11 08:32 -0000 Paul wrote:
> On Mon, 11 Jan 2021 09:26:01 +0100
> Thomas Leitner <t_leitner at gmx.at> wrote:
>
> > Yes, all the messages are in the same folder. However, how would
> > Claws determine the "parent message" if threaded by subject?
> > Because the In-Reply-To and References headers of all those
> > messages are the same in my case.
>
> Look at this thread, which your original message started. Your
> original message (the parent) obviously doesn't have a References
> header or an In-Reply-To header.

This thread works because there *is* an In-Reply-To header as well as a
References header for all messages after the original one (which
obviously can't have such headers). E.g. for you message:

Message-ID: <20210111083236.24978467 at localhost>
In-Reply-To: <20210111092601.7de2bc66 at noweto>
References: <20210108154622.22382003 at noweto>
 <20210111073615.5c63a055 at localhost>
 <20210111092601.7de2bc66 at noweto>

-- Thomas