fix(federation): unset reactions not working from remote

[ricardogarim]

Proposed changes (including videos or screenshots)

Issue(s)

• FDR-187

Steps to test or reproduce

Further comments

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability of reaction redactions in federated Matrix events by correctly reading nested event data. This ensures reactions are consistently identified and removed when redacted, reducing missed or incorrectly processed reactions. No changes to user interface or workflows.

[dionisio-bot]

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Latest commit: 8cc48b6

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[coderabbitai]

Walkthrough

Updates reaction redaction handling in ee/packages/federation-matrix/src/events/reaction.ts to read nested event fields (reactionEvent.event.type and reactionEvent.event.content) instead of top-level properties, maintaining existing control flow and error handling.

Changes

Cohort / File(s)	Summary
Matrix reaction event access update ee/packages/federation-matrix/src/events/reaction.ts	Switches from top-level reactionEvent.type/content to reactionEvent.event.type/content when validating and processing m.relates_to in redaction handler. No exported API changes.

Sequence Diagram(s)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested labels

stat: ready to merge, stat: QA assured

Suggested reviewers

• ggazzo
• rodrigok

Poem

A bunny hops through nested fields so neat,
From type to content, tucked within the beat.
Reactions fade when redactions chime,
No phantom likes to haunt through time.
Thump-thump—clean trails in matrix land,
Little paws, precise and planned. 🐇✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title accurately and concisely summarizes the fix by indicating that remote reaction unsetting in the federation module is being addressed. It follows conventional prefix usage and clearly reflects the main change in the pull request. It is clear and specific enough for teammates scanning history to understand the primary change without additional noise.
Linked Issues Check	✅ Passed	The PR corrects the nested event property access for reaction redaction events so that removals are properly detected and handled across federated rooms. This ensures that reaction unsets on the origin room propagate to remote rooms, fulfilling the key requirement of FDR-187. The changes align with the issue’s objectives by enabling zero reaction counts when all users un-react. No unrelated logic has been altered, and the update directly targets the propagation bug described in the issue.
Out of Scope Changes Check	✅ Passed	All modifications are confined to the reaction event handling code in the federation-matrix package and directly relate to processing remote reaction unsets. There are no additions or alterations to unrelated modules or features. The changes specifically target the bug described in FDR-187, and no out-of-scope functionality has been modified. This focused update ensures that only relevant code is touched.

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/federation-unset-reactions

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📥 Commits

Reviewing files that changed from the base of the PR and between 40a45d8 and 8cc48b6.

📒 Files selected for processing (1)

• ee/packages/federation-matrix/src/events/reaction.ts (1 hunks)

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🔇 Additional comments (1)

ee/packages/federation-matrix/src/events/reaction.ts (1)

59-64: Proceeding to retrieve the snippet for confirmation.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.39%. Comparing base (dca0b3a) to head (8cc48b6).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #37121      +/-   ##
===========================================
+ Coverage    67.38%   67.39%   +0.01%     
===========================================
  Files         3328     3330       +2     
  Lines       113342   113490     +148     
  Branches     20562    20600      +38     
===========================================
+ Hits         76375    76492     +117     
- Misses       34363    34393      +30     
- Partials      2604     2605       +1     

Flag	Coverage Δ
e2e	57.35% <ø> (+0.06%)	⬆️
e2e-api	40.56% <ø> (+0.13%)	⬆️
unit	71.16% <ø> (+0.01%)	⬆️

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