nnimap may have the same problem (was: gnus-summary-delete-article --> .overview not found)

[ShengHuo ZHU]

The problem is that nnmail-expiry-target might have the same backend
as that of the current group. nnmail-expire-target-group will call
nnchuck-possibly-change-group to switch to the target. The backend
should switch back to do the further work. I've fixed it for other
backends. Simon, could you fix it in nnimap?

ShengHuo

[Simon Josefsson]

ShengHuo ZHU <z...@cs.rochester.edu> writes:

Nnimap optimizes the case IMAP -> IMAP so it doesn't change the group
for copying, but a expiry-target which is a user-definable function
might do something like that (even though I didn't fully reproduce it)
-- I made the change, thanks.