On Thu 2019-01-24 07:05:13 -0400, David Bremner wrote:
> Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:
>
>> See also the thread on this maiing list with Subject "thread merge/split
>> proposal" from back in 2016, starting at
>> id:87mvp9uwi4.fsf@alice.fifthhorseman.net though i don't think any of
>> that has been implemented.
>
> Well, message properties were originally designed for that, iirc. So
> some of the prerequisites are tehre.

true, i didn't mean to skip over that.  It'd be great if Someone™ wanted
to pick up the thread there and add a "notmuch merge" and "notmuch
split" command on top of the properties work.

   --dkg