Spurious IMAP error for non-existent messages

[Uday Reddy]

Visiting an old IMAP folder, which apparently has messages that have been deleted on the server, resulted in an error

Retrieval from udrimap:test signaled: (vm-imap-protocol-error expected UID, RFC822.SIZE in FETCH response)

Looking through the IMAP session, we find

VM SELECT "test"
* 0 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1261233160] UIDs valid
* OK [UIDNEXT 52] Predicted next UID
VM OK [READ-WRITE] Select completed.
VM UID FETCH 25:25 (RFC822.SIZE)
VM OK Fetch completed.
VM NOOP
VM OK NOOP completed.
VM UID FETCH 25:25 (RFC822.SIZE)
VM OK Fetch completed.

Since the message with UID 25 doesn't exist on the server, there should not have been an error message for it.

[Uday Reddy (reddyuday)]

Backtrace:

Debugger entered--Lisp error: (vm-imap-protocol-error "expected UID, RFC822.SIZE in FETCH response")
  signal(vm-imap-protocol-error ("expected UID, RFC822.SIZE in FETCH response"))
  vm-imap-protocol-error("expected UID, RFC822.SIZE in FETCH response")
  vm-imap-get-uid-message-size(#<process IMAP> "25")
  vm-fetch-imap-message(...)
  vm-retrieve-real-message-body(... :fetch t :register t)
  vm-present-current-message()
  vm("imap:localhost:143:test:login:udrimap:*" :read-only nil :access-method imap)
  imap("imap:localhost:143:test:login:udrimap:*" nil)
  call-interactively(imap t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)