[imp] filter checking on inbox refresh

[Chuck Hagenbuch]

Quoting Liam Hoekenga <liamr@umich.edu>:

> seemed to me it might be nice if there were a preference you could set
> such that if you'd written personal filter rules, that you could have them
> automatically applied everytime your INBOX was refreshed (either by the
> "refresh" icon in the mailbox header, or if you've set the "New Mail"
> preference to check your inbox periodically).  The new preference is
> called "filter_on_refresh" and it's operation is based on the code that
> supports "filter_on_login".

I've committed a cleaned up version of this to HEAD. We can merge it for 3.1.

-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