## 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.
* feat!: Make bubbles, comments, and icons focusable
* feat!: Make ISelectable and ICopyable focusable.
* feat: Consolidate selection calls.
Now everything is based on focus with selection only being used as a
proxy.
* feat: Invert responsibility for setSelected().
Now setSelected() is only for quasi-external use.
* feat: Push up shadow check to getters.
Needed new common-level helper.
* chore: Lint fixes.
* feat!: Allow IFocusableNode to disable focus.
* chore: post-merge lint fixes
* fix: Fix tests + text bubble focusing.
This fixed then regressed a circular dependency causing the node and
advanced compilation steps to fail. This investigation is ongoing.
* fix: Clean up & fix imports.
This ensures the node and advanced compilation test steps now pass.
* fix: Lint fixes + revert commented out logic.
* chore: Remove unnecessary cast.
Addresses reviewer comment.
* fix: Some issues and a bunch of clean-ups.
This addresses a bunch of review comments, and fixes selecting workspace
comments.
* chore: Lint fix.
* fix: Remove unnecessary shadow consideration.
* chore: Revert import.
* chore: Some doc updates & added a warn statement.
* chore(deps): Add pretter-plugin-organize-imports
* chore: Remove insignificant blank lines in import sections
Since prettier-plugin-organize-imports sorts imports within
sections separated by blank lines, but preserves the section
divisions, remove any blank lines that are not dividing imports
into meaningful sections.
Do not remove blank lines separating side-effect-only imports
from main imports.
* chore: Remove unneded eslint-disable directives
* chore: Organise imports
* fix: delete area animation
* chore: format
* Update core/dragging/dragger.ts
Co-authored-by: Christopher Allen <cpcallen+github@gmail.com>
---------
Co-authored-by: Christopher Allen <cpcallen+github@gmail.com>
