[imp] remember expanded folders

[Chuck Hagenbuch]

Quoting Jan Schneider <jan@horde.org>:

> Why? It's only a problem if the user created a whole new subtree in another
> client. And it's the usual behaviour of any mail client I know of that they 
> don't expand folders they did not know before unless they expand all folders 
> by default.

Hmm. Well, show me some code. ;)

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"What was and what may be lie, like children whose faces we cannot see, in 
the arms of silence. All we ever have is here, now." - Ursula K. Le Guin