Cart associate and merge

[SteliyanPStoyanov]

When adding a new product to the cart and logging in, the cart is correctly associated with the account. However, if I log out, add a new product to the cart, and log in again, the carts do not merge. I have to log out and log in again to merge them. Additionally, if I add a new item to the cart and then log in, the carts never merge. And 'auth_policy' => 'merge',