"Apply promotions to the calculated price" setting is ignored

Describe your bug or feature request.

When setting the price formatted to "Calculated" (if using the price difference formatter module the bug applies too) and opting to incorporate discounts, the expected result would be that when you view a product to which a discount applies, it would show the discounted price. However, this is not the case, and only when adding a product to the cart is the discount calculated and visible to the end-user in the cart view and during checkout.

If a bug, provide steps to reproduce it from a clean install.

* Setup your price field to use the "calculated" formatted.
Make sure to enable "Apply promotions to the calculated price".

*Create a promotion for a 10% discount on a product

* View the product and see the original price is displayed, no mention of any discount.

* Add the product to the cart to verify that the discount is actually working.