Channel was sometimes marked as read on open

[laevandus]

🔗 Issue Link

Resolves: PBE-5810

🎯 Goal

Fix the issue or marking a channel as read when the first unread message was one of the first not visible messages

🛠 Implementation

The fix is a workaround to the SwiftUI issue where the LazyVStack pushed to the NavigationStack has initially larger height and therefore trigger onAppear for more messages than it should. This causes ChatChannelViewModel to mark the channel as read because it thinks the user also saw the first unread message. Apple's feedback id is: FB15010770.

🧪 Testing

1. Open a channel
2. Scroll to the second message which was not visible on channel open
3. Use mark unread using that message
4. Go to channel list and open the same channel again

Before: Unread message pill appeared for a split second and the channel was marked as read
Expected: Unread message pill appears at the top of the channel view.

🎨 Changes

Note how in the before video the second opening on the channel marked it as read (the pill went away).

Before	After

☑️ Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamChatSwiftUI	7.06 MB	7.06 MB	+2 KB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
88 New issues
0 Accepted issues

Measures
0 Security Hotspots
72.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud