[pranvinit]

What?

Closes #82273.

Show participants across all relevant note threads in the block toolbar.

Why?

The indicator showed only one thread’s participants, hiding users who contributed to other threads on the same block.

How?

Aggregate and deduplicate authors and repliers across unresolved threads, falling back to resolved threads when necessary. Preserve navigation and avatar overflow behavior.

Testing Instructions

1. Using two users, add block-level and inline notes to the same block.
2. Confirm both users appear in the toolbar indicator.
3. Resolve, reopen, or delete a thread and verify the avatars update.
4. With four participants, confirm two avatars and +2 appear.

Validation: 104 focused tests and changed-file lint passed. Build and E2E checks were not run.

Testing Instructions for Keyboard

Navigate to “View notes” in the block toolbar. Activate it with Enter or Space and confirm focus moves to the primary note thread.

Screenshots or screencast

Not included.

Use of AI Tools

Codex assisted with implementation, tests, documentation, and this PR description.

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[Mamaduka]

Thanks for contributing, @pranvinit!

I see that the linked issue already has a PR (#82357. What's the reason for creating a separate one? It's not clear why this alternative is better.

I would recommend contributing by testing/reviewing similar cases.

[Mamaduka]

Closing this in favor of original PR.