spree/spree_active_shipping — pull request #45 by j15e (2012-10-04 21:02:32+00:00)
Title: Rescue from shipping error in orders controllers.

Shipping price may be calculated when adding products to order if user is logged & address is filled.

Think it might be better for users to redirect them to request.referrer but redirecting to referrer doesn't seems to be a really good practice.