[Imap-protocol] Expunges and copying

[Timo Sirainen]

What do you think, should this be allowed:

Sessions 1 and 2 have selected a mailbox and have an identical view of
it. Then:

C1: 1 EXPUNGE
S1: * 1 EXPUNGE
S1: 1 OK

C2: 2 COPY 1 elsewhere
S2: * 1 EXPUNGE
S2: 2 OK

i.e. the second session can copy a message that was already expunged in
the first session? I guess this isn't all that much different from being
able to FETCH the message, but somehow it feels to me like allowing COPY
could be bad..
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