I've been searching for days without finding any answers for my conundrum.
I want to make a module that reacts when an item in the cart has changed/updated it's quantity, but I can't find any guide that tells me how to do that. I know several different ways to get all the items in the cart, I know how to get the item added to the cart, but not how to just get the specific item that has been changed in the cart.
I'm using Magento 2, but due to the similarities a guide for how to do it in Magento 1 could still useful to me.
Is there anyway to get the item that has changed/updated in the cart?