[Twisted-Python] IMAP4Client closes connection cleanly during search()

[Johannes Beigel]

In reply to myself I want to mention some oddity I just figured out 
during debugging: The _lastCmd attribute of the IMAP4Client instance 
always contains the CAPABILITY command (I print it after every issued 
and completed IMAP command). This happens even if I run the test with a 
smaller mailbox folder, where everything works.

-jojo