Port v6: Fix reactions modal crash when no reactions can be displayed

[andremion]

Port of #6475 to v7 (develop).

Closes AND-1194.

Goal

Fix the IllegalArgumentException: Span count should be at least 1. Provided 0 crash from UserReactionsView.bindReactionList when the reactions modal opens on a message whose filtered latestReactions ends up empty. The same buggy code is present on every v6 release from 6.35.0 through 6.38.0 and on develop.

Implementation

UserReactionsView.bindReactionList set gridLayoutManager.spanCount directly from the size of the filtered reaction list:

gridLayoutManager.spanCount = userReactionItems.size.coerceAtMost(MAX_COLUMNS_COUNT)

When userReactionItems is empty, spanCount = 0 is passed to GridLayoutManager.setSpanCount, which rejects it.

Clamp the value to at least 1:

gridLayoutManager.spanCount = userReactionItems.size
    .coerceAtMost(MAX_COLUMNS_COUNT)
    .coerceAtLeast(1)

./gradlew apiDump produced zero .api diff, confirming no public surface change.

Testing

See #6475 for the manual repro patch and full testing notes. Also verified on this branch:

• ./gradlew spotlessApply detekt apiDump — clean.

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue where the reaction layout could fail to display properly when the reaction list was empty, ensuring consistent grid formatting.

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled, or the PR is bot-authored.
• An issue is linked (Linear ticket or GitHub issue), or the PR is bot-authored.

🎉 Great job! This PR is ready for review.

[andremion]

@CodeRabbit review

[coderabbitai]

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Review triggered.

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[coderabbitai]

Walkthrough

UserReactionsView now clamps the GridLayoutManager's spanCount to a minimum of 1 and maximum of MAX_COLUMNS_COUNT based on reaction count. Previously, empty reaction lists could set spanCount to 0, which is invalid.

Changes

User Reactions Grid Layout Fix

Layer / File(s)	Summary
GridLayoutManager spanCount bounds validation stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/list/reactions/user/internal/UserReactionsView.kt	spanCount is computed by clamping userReactionItems.size to a range between 1 and MAX_COLUMNS_COUNT, preventing zero span count when the reaction list is empty.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A grid that once collapsed to naught,
Now holds its ground with minimum thought,
One span at least, a rabbit's delight,
The reactions dance, arranged just right!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ 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%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description provides a clear Goal, Implementation with code examples, and comprehensive Testing notes referencing the original issue.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and specifically describes the main change: fixing a crash in the reactions modal when no reactions can be displayed, which aligns perfectly with the code change that clamps spanCount to prevent it from becoming 0.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch port/v6-to-develop/user-reactions-empty-span-count

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[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-chat-android-client	5.82 MB	5.82 MB	0.00 MB	🟢
stream-chat-android-ui-components	11.02 MB	11.02 MB	0.00 MB	🟢
stream-chat-android-compose	12.44 MB	12.44 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud