Inline blocks missing section delta extra data on filtered block definitions

This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.

For the the tests requested in #5

Rebased the MR against 11.x. Still needs tests.

The previous issue added these in LayoutBuilderTest::testLayoutBuilderChooseBlocksAlter

will give the tests a stab

Extended the existing test coverage (since moved to LayoutBuilderBlocksTest)

Also replaced a few unnecessary HTTP requests with API and accessing the manage layout url directly.

Sorry not super clear what are the steps to trigger this issue?

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

This makes sense to have. Done a review, code changes & test coverage look good. Happy to RTBC.