Marks added in nnir search buffers don't propagate to the actual groups?

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Can anyone confirm that changes to marks made in an nnir search buffer
don't propagate to the real articles? Eg you search for an article,
remove its read mark, and then expect to find it unread in the "real"
underlying group. Or you tick it, or whatever.

This is something I noticed ages ago, but sort of figured it was a
problem in my config, but now I've looked into it and so far as I can
tell this is just the way it works.

When I search an nnimap group, and tick an article in the resulting nnir
summary buffer, I can see that nnir asks the nnimap backend about
updating the mark, but the mark is never actually set.
`gnus-summary-exit' is supposed to apply all marks to the backend, but
it very carefully doesn't do that for ephemeral groups (and that code is
ancient).

I sure thought this used to work, though. Maybe nnir used to apply marks
immediately (ie, not waiting for summary exit), but doesn't anymore? Am
I just dreaming? Does anyone have any idea of how this is supposed to
work?

Thanks,
Eric