0007254: Add to basket does not force a refresh of order confirmation step
Description
Adding something to the basket in another tab while you are on the order confirmation step does not force a reload or trigger any error message.
Unfortunately this behaviour is illegal within the EU because someone ordered something without getting a clear price declaration upfront.
Steps To Reproduce
1. Add a product to the basket
2. go through all steps until you reach the "Ready!" step, but do NOT click "Order Now" yet
3. open the shop in another tab and add something else to the basket
4. go back to the first tab still showing the old summary and click "Order Now"
5. Check in the backend that the order was actually submitted with the new total and the new product(s)
6. realize this is illegal in the EU since what you really ordered in step 4. was not displayed to you properly
Additional Information
This missing validation also causes us issues in a project because we skip some parts of the checkout if only downloads are in the basket. But this also means you can skip the parts of the checkout by just putting a download to the basket, go to the order confirmation step, then add everything else and the shop owner then has trouble to fulfil the order.
