Finding a thread based on message-id?

[Alex Bennée]

Hi,

I've been tracking some high volume mailing lists that I don't subscribe
to via lore.kernel.org and gmane.io's NNTP interfaces (using gnus as
intended ;-). However I'm running into a problem finding some threads
again after I've read them. What's the correct gnus way to resurface and
narrow to a thread when you say know the message-id of the head of the
thread?

-- 
Alex Bennée