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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Expiry and nnimap: ghost articles
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prj@po.cwru.edu (Paul Jarc) writes:

> Simon Josefsson <jas@extundo.com> wrote:
> > Yes, since nnimap doesn't support `nnchoke-request-move-article' (it is
>> impossible to implement in IMAP) Gnus does retrieve+delete instead, and
>> the delete code move things into the expiry-target.
>
> Couldn't nnimap just do the retrieve+delete within
> -request-move-article?

Um, yes, now that I look at it, this is how it is done. :-) I was
thinking of `nnchoke-request-replace-article'...

Then I wonder why this happens.  Ah, yes -- if you move an article
from a nnimap group to a nnfolder group (which was the case in this
thread), moving doesn't happen within one backend, so Gnus does
retrieve+delete.  And nnimap can't know this case from the case where
articles are simply expired.  Neither could nnml or nnfolder, so I
guess this is a generic problem.