reason=session not honoring alternate login screens.

[liamr@umich.edu]

Hey -

we're occasionally seeing this...

https://mail-test.www.umich.edu/horde/imp/login.php?1=1&reason=session

"Your Mail session has expired. Please login again."
The users get presented a standard IMP login screen, instead of our custom one
(defined with the $conf['user']['alternate_login'] directive).

login.php has code that should bounce people to an alternate_login screen when
it sees "login", "failed", "timeout", and "logout" reasons... any reason not to
add "session"?

liam