Is it possible for a customer to use gift card for double discount?

[drchen]

If I issue a gift card during a discount promotion, a customer purchase it, but use it in the future during another promotion, so this situation will be double discount?

For example, customer spend $80 to get a $100 value gift card now, in the future there is another 20%off promotion, he can use this $100 gift card for a $125 order?