That's how moving is done with IMAP. Copy + mark as deleted. Dovecot is buggy only if the message isn't left marked as deleted. Expunge would then delete the message entirely.
Timo, I think you don't understand the problem. Let me explain it once more in other words.
I have two namespaces, the default one and another one. In both namespaces, I have made a folder called 'Test'. Let's refer to this folders as:
'Folder A': 'Test' in the default namespace.
'Folder B': 'Test' in the not-default namespace.I have a message in 'Folder B' and I transfer this message to 'Folder A'. The message is marked as deleted in 'Folder B', but 'Folder A' does *not* contain the moved message, even though I refreshed the folder list.
When expunging the message in 'Folder B' it disapears, but after a folder refresh, the message apears again and it's not marked deleted. The message is still not in 'Folder A'.
I think this is incorrect behaviour and therfore a bug.
Regards, Remy