Improve SectionListTrait::setSection delta error message

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to the Core change policies → .

Hi @quietone this is my first contribution to Drupal. I've updated the SectionListTrait delta error message to be more descriptive by including available deltas and section count. Please let me know if any adjustments are needed - I'm happy to refine this further.

@penyaskito Thank you for the feedback! I've implemented the simplified error message as suggested.

Tested this with my MR at ✨ Provide a Config Action to add/edit a component in a layout Active and the error message is "Invalid section delta "10", there are 2 sections." as expected

We have a test at Drupal\Tests\layout_builder\Kernel\LayoutBuilderEntityViewDisplayTest depending on the error message.

I have updated the error message in the test to $this->expectExceptionMessage('Invalid section delta "2". There are 2 sections.'); Ready for review..

There's some code standards failing on the test file. I'm guessing your editor is trying to autoformat something that it shouldn't.

Yup, I noticed the auto formatting now! It is fixed now!!

Yup i noticed the auto formatting! It is fixed now!!

Simple change, tests passing.