imap-msgpart-url: Attempt to reuse selected mailbox instead of reallocating a new one. Besides giving slightly better performace, this also fixes CATENATE for mbox when source and destination mailboxes are the same.
imap-msgpart-url: Attempt to reuse selected mailbox instead of reallocating a new one.
Besides giving slightly better performace, this also fixes CATENATE for mbox
when source and destination mailboxes are the same.

damoxc/dovecot,damoxc/dovecot,damoxc/dovecot,damoxc/dovecot,damoxc/dovecot