[Evolution] "Hide read threads" feature

[Justin A <justin bouncybouncy net>]

I've just started using evo again and its working a lot better since the
last time I used it:)

The only thing that's missing that I see is that there is no way to hide
read threads, only read messages.  It would be nice if you could hide
threads in which all the messages are read, and if a new message
arrives, the thread will become visible for reference again.

Is this possible now, or even planned?
-- 
-Justin