[Woo POS] Mechanism to handle quantities Product List <-> Cart

[iamgabrielma]

Currently the "quantity" element in the ProductCardView is just a placeholder and does not update when products are added/removed from the cart:

We need a mechanism to handle that, from the initial designs:

• Tapping the + should both increase the quantity number and make a new row appear in the Cart view
• Removing products from the cart should also update the quantity

Additionally we should also add some sort of fake "stock" property to the Product model for the moment, so it disallows to add more products than available in stock to the cart. This could represent the Yosemite.Product for the time being stockQuantity property.

[dangermattic]

Thanks for reporting! 👍

[iamgabrielma]

P2: p91TBi-bcW-p2#comment-12123