[isekovanic]

🎯 Goal

Fixes #3903 and the related pagination problems found while testing it.

Linear ticket: https://linear.app/stream/issue/RN-471/offline-support-channels-hydrated-from-the-local-db-get-hasprev-false

With offline support, channels hydrated from the offline DB could end up with hasPrev = false even when the server has older messages, so scrolling up never requests them. The offline DB returns at most 24 messages per channel (RowNum < 25).

Testing it also showed that the message lists stop paginating after a single failed request and that MessageFlashList cannot load older messages when the loaded ones do not fill the screen.

🛠 Implementation details

• Channels loaded from the offline DB can get hasPrev = false when the server still has older messages, so scrolling up never loads them. The offline DB returns at most 24 messages per channel and ignores the list's message_limit, so the client reads a short cached page as the start of the channel. Fixed in 06e1be3, together with fix: read cached channels against the query's message_limit stream-chat-js#1958. The offline DB now returns the newest message_limit messages per channel (25 when not set), and the client reads that page against the same limit.
• The offline DB can show messages with gaps between them. If messages 1-10 were cached in one session and 16-25 in a later one, they show up back to back with 11-15 missing. Fixed in 06e1be3, since only the newest message_limit messages are read now.
• After a failed request (offline, timeout or w/e), MessageList and MessageFlashList stop paginating until the number of messages changes. loadMore, loadMoreRecent and loadMoreThread swallow their errors, so the lists treat the failure as a successful load. Fixed in 65b9bf5, so if a load adds nothing the list tries again on the next scroll after a 2 second backoff.
• MessageFlashList can't load older messages when the loaded ones don't fill the screen, because it only paginates on scroll events and a list that short can't scroll. Fixed in 7e6b5e7 with the same prefill MessageList has.

🎨 UI Changes

/

🧪 Testing

/

☑️ Checklist

• I have signed the Stream CLA (required)
• PR targets the develop branch
• Documentation is updated
• New code is tested in main example apps, including all possible scenarios
  • SampleApp iOS and Android
  • Expo iOS and Android

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
js_bundle_size	2036 KB	2037 KB	+1268 B	🟢
ai_components_size	163 KB	163 KB	0 B	🟢

[stream-ci-bot]

🎉 This PR is included in version 9.11.1 🎉

The release is available on:

• v9.11.1
• GitHub release

Your semantic-release bot 📦🚀