spree/spree — pull request #5508 by wuboy0307 (2014-10-21 03:03:30+00:00)
Title: check track_inventory_levels config in order cart

In admin order cart, it only check variant track_inventory to decide whether a variant can be added to cart.
However, if Spree::Config[:track_inventory_levels] is false, all variants should always be added freely.