fix: state synchronisity mismatch

[isekovanic]

🎯 Goal

This PR fixes an unfortunate issue with state not being properly synchronized in certain situations (typically on lower end devices), where the updates of our processedMessageList would be ahead of the updates of the previous and next message store.

Even thought there's a dependency on processedMessageList, since renderItem is already memoized and the message references are stable from the work done on the MessageList the past few months, this does not in fact degrade performance while we focus on correctness.

🛠 Implementation details

🎨 UI Changes

iOS

Before	After

Android

Before	After

🧪 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	339 KB	339 KB	0 B	🟢