Applied discount code is lost when logging in / creating account / placing an order with account creation

[revlis-x]

Current behavior

When a user logs in after applying a discount code ("mmtest") in the cart (e.g. log-in on checkout page), the discount code is no longer applied.
Moreover, if the user chooses to create an account during checkout, the order is placed without the applied discount code.

Expected behavior

Discount code is kept applied when user logs in or creates an account.

Steps to reproduce the issue

1. Put item into cart and apply discount code "mmtest"
   2a. Create or log into existing account -> discount no longer applied
   2b. Create account during checkout -> order is placed without discount

Can you handle fixing this bug by yourself?

• YES
• NO

Which Release Cycle state this refers to? Info for developer.

Pick one option.

• This is a bug report for test version on https://test.storefrontcloud.io - In this case Developer should create branch from develop branch and create Pull Request 2. Feature / Improvement back to develop.
• This is a bug report for current Release Candidate version on https://next.storefrontcloud.io - In this case Developer should create branch from release branch and create Pull Request 3. Stabilisation fix back to release.
• This is a bug report for current Stable version on https://demo.storefrontcloud.io and should be placed in next stable version hotfix - In this case Developer should create branch from hotfix or master branch and create Pull Request 4. Hotfix back to hotfix.

[pkarw]

Good point! User authorization changes the shopping cartid (if user had the shopping cart assigned in magento) and in this case the discount code needs to be re-applied