fix(runtime): properly set parent classes in children scope

[christian-bromann]

What is the current behavior?

When using renderToString to hydrate scoped web components, the "scoped" classes are not being applied correctly to the children of the host element.

GitHub Issue Number: #6219

What is the new behavior?

When using renderToString with serializeShadowRoot: 'scoped', the children of the host element should properly have the sc-web-component-name class applied and all the defined styles that come with it.

Documentation

Does this introduce a breaking change?

• Yes
• No

Testing

Updated tests that were incorrectly corrected before.

Other information

n/a

[Armand-Lluka]

Thanks for the work on this and the performance issue. This seems to resolve the in the example I created, however I would like to test this out in a real-world application. Can you create a dev build for me if possible?

[johnjenkins]

hey both - I think this PR should be closed in-favour of #6238
The old updateElementScopeIds / findScopeIds methods add regressions (i.e the tests :) ) where the scoped classes are over-zealously applied to everything.

[christian-bromann]

Closing in favor of #6238