[sylpheed:31871] How to delete orphaned IMAP tree?

[Dennis Carr]

Well, I"m using Sylpheed again.  Got frustrated with Thunderbird (or
Icedove, as they call it in Debian), as the spam filter kind of worked.

Thing is, the way I transplanted my mail was using IMAP4 to get it up
to the server, and then back down - but now I have this orphaned IMAP
tree sitting in my list.  I can't seem to get rid of it.  How do I
remove it?

-Dennis Carr