ProductAdapter_onBindViewHolder.kt

override fun onBindViewHolder(
        holder: ProductViewHolder,
        position: Int,
        payloads: MutableList
    ) {
        if (payloads.isEmpty()) {
            onBindViewHolder(holder, position)
        } else {
            for (data in payloads) {
                when (data as Int) {
                    INVALID_PRODUCT_POSITION -> holder.updateProductQuantity(products[position].quantityInCart)
                }
            }
        }
    }