Check for new session messages after cart totals have been processed.

[navarr]

Useful for third party modules that may perform operations during totals calculation (e.g. third party tax services)

Description

This change asks customerData to reload its messages after the cart's default totals processor has completed (success or failure).

Fixed Issues (if relevant)

Resolves BUNDLE-1495

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @navarr. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me {$VERSION} instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Assistant documentation

[osrecio]

Hi @navarr , Thanks for your contribution. Can you check the Travis Errors ?

[osrecio]

Thanks @navarr , now looks like ok. I will test ASAP and I will proceed to process.

[sidolov]

Such changes will add one more request to the server on every totals calculation request. I think it's not optimal way for define extension points. Messages should be reloaded only in cases when needed (by additinal handlers in 3d party extensions).

[navarr]

Fair enough. #17127 takes care of that.

Only concern at this point is that there's no way for one module to know if another has decided to do that, but I think it'll be fine. I'll retract this PR then