Voucher with free delivery shows shipping cost on cart detail (PS 1.7.6.5 / classic theme)

[val_carter]

Hi, this is my first post reporting a ¿bug? so I hope I'm doing on the right section.

My problem is that when I create one voucher that includes free shipping, on the cart detail the quantity discount generated is correct but it includes the shipping cost instead of set it to zero. The option that I marked on the voucher is the following:

The following image shows my problem on the cart detail (10% discount with free shipping):

It can be confusing because the customer continues seeing a shipping cost (on the image "Transporte") and the discount ("Descuento") is showing the 10% + shipping cost instead of:

I think this is more user-friendly, I do not if it is a config problem or if doing same change on the cart.php or similar cart rules can be include on the shipping costs calculated.

Regards and thanks!