## The basics
- [x] I [validated my changes](https://developers.google.com/blockly/guides/contribute/core#making_and_verifying_a_change)
## The details
### Resolves
Fixes#9027
### Proposed Changes
Ensure that a block being dragged is properly focused mid-drag.
### Reason for Changes
Focus seems to be lost due to the block being moved to the drag layer, so re-focusing the block ensures that it remains both actively focused and selected while dragging.
The regression was likely caused when block selection was moved to be fully synced based on active focus.
### Test Coverage
This has been manually verified in Core's simple playground. At the time of the PR being opened, this couldn't be tested in the test environment for the experimental keyboard navigation plugin since there's a navigation connection issue there that needs to be resolved to test movement.
It would be helpful to add a new test case for the underlying problem (i.e. ensuring that the block holds focus mid-drag) as part of resolving #8915.
### Documentation
No new documentation should need to be added.
### Additional Information
This was found during the development of https://github.com/google/blockly-keyboard-experimentation/pull/511.
* chore(deps): Bump chai from 4.3.10 to 5.1.1
Bumps [chai](https://github.com/chaijs/chai) from 4.3.10 to 5.1.1.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](https://github.com/chaijs/chai/compare/v4.3.10...v5.1.1)
---
updated-dependencies:
- dependency-name: chai
dependency-type: direct:development
update-type: version-update:semver-major
...
Signed-off-by: dependabot[bot] <support@github.com>
* fix(tests): Migrate all usage of chai to ESM (#8216)
* fix(tests): Migrate node tests from CJS to ESM
This allows us to import (rather than require) chai, fixing failures
caused by that package dropping suppport for CJS in chai v5.0.0.
* fix(tests): Have mocha tests directly import chai
Previously they relied on obtaining it from the global scope, but it's
better if imports are explicit.
* fix(tests): Remove broken load of chai as script
Chai v5.0.0 no longer supports being loaded as a script, so this did
nothing but emit an syntax error message on the console.
* fix(tests): Migrate browser tests from CJS to ESM
This allows us to import (rather than require) chai, fixing failures
caused by chai no longer supporting CJS.
* chore(tests): format
---------
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Christopher Allen <cpcallen+git@google.com>
