[imp] old "Empty Trash" button behavior

[Liam Hoekenga]

Back in 4.0.x, the "Empty Trash" icon would empty the trash, push a "the 
trash has been emptied" message into the notification stack, and then 
return you to the mailbox from which you invoked that action.

I think starting in 4.1.x, it would leave you in the trash mailbox, 
showing you that it was empty.

Can someone remind me as to why the behavior changed?   If I wanted to 
revert to the old behavior, do Horde generate urls still support a 
"return_url" value?

Liam