J. P. Gilliver (John) wrote:
On Thu, 6 Aug 2020 at 02:57:39, John Doe
wrote:
Why did this post show up, after I ignored the thread?
Something to do with this poster constantly crossposting?

And nymshifting.

Threading is mainly done with References: line, which has
a ~1000 character limit. The sub-thread in this case, has
sufficient MID entries, to be associated with the main
thread. An Ignore-Thread should have worked.

Threading is weakly based on Subject, in that if the
References: line is empty, a bunch of posts with "Help"
as the Subject: , could be presented as if they were
the same thread.

I don't think anything else matters when it comes
to the topic of threading, because we do have
posters who change subject mid-thread, and
that never seems to throw off the reader.

The sub-thread in question *is* missing a Google Groups posting.
Maybe that has affected the "math" the reader uses
to judge whether it's a new thread or something.
Looking backwards and noticing there's a gap
and that upsets the "math". I'm really surprised
readers don't place a Missing entry on the screen,
to represent an item that is nominally threaded,
but is not available in the spool.

It seems Mixmin treats Google a bit differently than
the other servers do.

Paul