Shipping Method should be updated or deleted in cart

[fjacobi]

From what I understand you can follow the checkout, choose a shipping method and then return to the cart. You can see your chosen shipping method.

If you change the number of products, the shipping method won't change, even if you "break" it (meaning price is higher than allowed for this specific method or shipping weight, etc.).
And then you can follow the checkout UNTIL the checkout summary, where the correct shipping method is shown.

I think there should be a check in ProductCollection to check if the current shipping method is still valid.

/edit: Source
https://community.contao.org/de/showthread.php?46994-Falsche-Versandkosten-bei-Warkenkorbaktualisierung