Keep messages only this device has when a grouped channel list refreshes

[gpunto]

Goal

When a grouped channel list refreshes its first page (for example on every reconnect), each row is replaced with the
server's copy. Messages that exist only on this device disappear from the channel preview. One example is a send that
the backend answers with a type="error" message it never stores. The chat itself still shows them. The regular
channel list keeps them.

Closes AND-1564

Implementation

• On the grouped first page, only remove the existing channels that are missing from the new page. Channels still in the
  page keep their current copy, so joinMessages merges it with the server's, as the regular refresh does.
• Channel order is unchanged: the list is sorted by its comparator, and the cids are still reset from the page.

Testing

QueryChannelsLogicGroupedTest checks that only the channels dropped from the page are removed.

On a device, using the grouped channels sample against locally published builds: send a message the backend answers with
type="error" (text over 5000 characters), then reconnect. Before the change the row dropped the message; after it, the
message stays as the row's last message.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Channels that remain in a first-page grouped result now retain their existing local data, including messages stored only on the device. Channels missing from the result are still removed.

[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 ignored for dependabot PRs).

🎉 Great job! This PR is ready for review.

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-chat-android-client	5.26 MB	5.32 MB	0.06 MB	🟢
stream-chat-android-offline	5.49 MB	5.54 MB	0.05 MB	🟢
stream-chat-android-ui-components	10.64 MB	10.76 MB	0.11 MB	🟢
stream-chat-android-compose	12.87 MB	13.15 MB	0.28 MB	🟡

[gpunto]

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Walkthrough

On the first page of a grouped result, applyGroupedResult now removes only existing channels whose CIDs are absent from the returned page. The grouped-result test checks retention of a channel that appears in both the existing state and the new page.

Changes

Grouped channel replacement

Layer / File(s)	Summary
Retain channels in the returned page stream-chat-android-state/src/main/java/io/getstream/chat/android/state/plugin/logic/querychannels/internal/QueryChannelsLogic.kt, stream-chat-android-state/src/test/java/io/getstream/chat/android/state/plugin/logic/querychannels/internal/QueryChannelsLogicGroupedTest.kt	The first-page logic removes existing channels missing from the returned page. The test verifies that an existing channel present in the page is not removed.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to cac1e

A grouped-channel preview may continue showing old message text after a refresh. Correct the merge order and strengthen the regression test; the remaining risk is bounded.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving device-only messages when a grouped channel list refreshes.
Description check	✅ Passed	The description includes the goal, implementation details, issue reference, unit test coverage, and device validation steps. UI sections, checklists, and the GIF are not completed, but they are non-cr…
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.

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_{A rabbit checks the channel rows,
The kept one stays; the absent one goes.
A fresh page lands with CIDs in view,
The test confirms what the code will do.
Hop, hop, the first-page check is through.}

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In
`@stream-chat-android-state/src/main/java/io/getstream/chat/android/state/plugin/logic/querychannels/internal/QueryChannelsLogic.kt`:
- Around line 313-314: Update the message merge in joinMessages to place
returned messages before retained channel messages before applying distinctBy on
message IDs, preserving returned content for duplicate IDs and local-only
messages afterward.

In
`@stream-chat-android-state/src/test/java/io/getstream/chat/android/state/plugin/logic/querychannels/internal/QueryChannelsLogicGroupedTest.kt`:
- Around line 108-131: Update the first-page retained-channel test around
`applyGroupedResult` to use a concrete `queryChannelsStateLogic` and seed the
retained channel with a local message. Set the refreshed channel’s messages to
empty, then assert after applying the grouped result that the retained channel
still contains the seeded message with ID "local".

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ℹ️ Review info

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Configuration used: Repository UI

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Run ID: 40d3d3a8-b6dd-4ad2-b5e1-f51b0961adcf

📥 Commits

Reviewing files that changed from the base of the PR and between b1e6147 and cac1edb.

📒 Files selected for processing (2)

• stream-chat-android-state/src/main/java/io/getstream/chat/android/state/plugin/logic/querychannels/internal/QueryChannelsLogic.kt
• stream-chat-android-state/src/test/java/io/getstream/chat/android/state/plugin/logic/querychannels/internal/QueryChannelsLogicGroupedTest.kt

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[aleksandar-apostolov]

Two small things, both optional.

The new real-state test pins that the local-only message survives — could it also assert the other direction, that the server's copy of the channel won (name == "refreshed")? Nothing covers that today; the mock-based test only checks addChannelsState was called.

Also, when the page still contains every existing channel, removeChannels now gets an empty set and still writes setCids/setChannels. Worth a takeIf { it.isNotEmpty() } so the common path skips it?

[gpunto]

@aleksandar-apostolov thanks, took both in 34d9067. The real-state test now also checks the channel's own fields come from the server copy (name == "refreshed"), and the removal is skipped when every existing channel is still in the page, with a test for that case.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
87.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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