give image cluster priority over the emoji for group conversations

[cameronvoell]

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Note

Give image clusters priority over emoji for group conversation avatars

• Updates Conversation.avatarType in Conversation.swift to return a clustered member avatar when any member has a profile photo, falling back to the seeded emoji only when no member avatars are available.
• Updates ConversationsViewController.diff-changed-items to include avatarType in the change-detection predicate, so cells refresh when the avatar type changes.
• Behavioral Change: group conversations with a seeded emoji will now show a member photo cluster instead if any members have avatars.

^{Macroscope summarized 5b78b5b.}

[cameronvoell]

• give image cluster priority over the emoji for group conversations #1140 👈 (View in Graphite)
• dev

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[claude]

Claude finished @cameronvoell's task —— View job

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Code Review Complete

Summary

This PR successfully prioritizes member avatar clusters over seeded conversation emojis for group conversations. The implementation is clean and well-tested.

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Code Quality: ✅ Excellent

Conversation.swift (lines 232-258):

• Logic change is clear and correct: checks member avatars before conversation emoji
• Comment at lines 248-252 excellently explains the design decision
• Follows existing patterns and conventions

View Controller Change:

• Line 186 in ConversationsViewController.swift adds avatarType comparison to trigger cell reconfiguration when member avatars change
• This is the key fix for stale cluster rendering - essential for making the priority change visible in the UI

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Test Coverage: ✅ Comprehensive

New Test File (ConversationsRepositoryAvatarObservationTests.swift):

• Tests database reactivity when member avatars change (lines 88-118)
• Includes control test to verify observation mechanism works (lines 120-145)
• Excellent comments explaining the bug hypothesis being tested (lines 7-21)

Updated Test File (DefaultConversationDisplayTests.swift):

• Line 550: New test avatarTypeClustersOverSeededConversationEmoji specifically validates the priority change
• Lines 553-555: Comment references the bug (feat: stable conversation emoji in shared metadata + invite payloads #686) and explains the decision reversal
• Test creates a group with member avatars AND a seeded emoji, then verifies the cluster wins
• Lines 605-609: Assertion confirms clustered avatar type with correct profile count

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Potential Issues: ⚠️ Minor

1. Observation Test May Be Flaky
ConversationsRepositoryAvatarObservationTests.swift:99 and 113

• Uses hardcoded sleep durations (300ms, 800ms) for async observation
• These timing-based tests can fail on slow CI machines
• Recommendation: Consider using expectation-based waiting or increase timeouts with documentation

2. EmissionCounter Thread Safety
ConversationsRepositoryAvatarObservationTests.swift:148-161

• Uses @unchecked Sendable with manual NSLock synchronization
• Implementation is correct, but Swift 6 strict concurrency may flag this
• Recommendation: Consider using OSAllocatedUnfairLock or actor-based counter for future-proofing

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Performance: ✅ Good

• hasAnyAvatar check (line 254) is efficient - short-circuits on first avatar found
• sortedForCluster().prefix(7) limits cluster size appropriately
• No performance concerns introduced

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Security: ✅ No Concerns

No security implications in this change.

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Suggestions for Improvement

Optional Enhancement:
Consider adding a test case for the scenario where:

• A group starts with no member avatars (shows emoji)
• A member adds an avatar
• The UI should switch from emoji to clustered avatars

This would validate the full reactivity chain end-to-end.

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Verdict: ✅ Approve

This PR successfully addresses the stated issue with clean code, comprehensive tests, and good documentation. The minor issues noted are not blockers.

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[macroscopeapp]

Approvability

Verdict: Approved

This PR reorders avatar display priority for group conversations (showing clustered member photos over auto-seeded emoji) and fixes a UI refresh issue. The changes are self-contained, well-tested, and limited to visual display logic with no broader runtime implications.

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