Drafts in latest SVN

Although I don't use roundcube as my primary mail client, I do tend to use it at the office, which firewalls regular IMAP ports. One thing I noticed today while composing a message was that I ended up with multiple copies of said message in the drafts folder. The message took a while to put together, and I appreciate the automatic draft saving, but I also feel like subsequent saves should replace the current, rather than add to it. If not, then all of the copies should be removed when the final message is sent.

Not sure if this is a bug or a 'feature', but I thought i should point it out.

Thanks.