Bugfix: Do not mark channel as read for new members

[polqf]

🔗 Issue Links

https://github.com/GetStream/ios-issues-tracking/issues/653

🎯 Goal

Stop marking channels as read for new members

📝 Summary

Seems like we were marking the chat history as read for new channel members. This created a situation where on adding a member, all the messages in the history would increase their read count by one.

🛠 Implementation

Stop marking as read for a new member in MemberEventMiddleware

🧪 Manual Testing Notes

1. Create a group
2. Send a message
3. Add a new member

Expected result:

• Read counts on messages should not increase

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change follows zero ⚠️ policy (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (docusaurus, tutorial, CMS)

🎁 Meme

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
44 Code Smells

90.7% Coverage
0.1% Duplication