156C

Didn't find anything in the BugReports that resembled this issue

When using a discount coupon which only applies to shipping, ie:free shipping checkbox, shipping is zero'd so the display is incorrect but the total is correct.

Subtotal: Correct
Discount Coupon: Correct
Shipping: Incorrect ie: changed to zero
Sales Tax: Correct
Total: Correct

Since the Shipping has been changed to zero based upon the discount code, the numbers visually do not add correctly.
Since only one discount coupon is allowed, and it is for free shipping, shouldn't the shipping value still show along with the discount code for that same amount... thus cancelling each other.

I don't recall my previous version (zc154) removing the shipping amount or zeroing the shipping amount, so that the displayed math was correct.