fix(chat): banner "num new messages" fixed

[molimauro]

What this PR does 📖

• Title

Which issue(s) this PR fixes 🔨

• Resolve #5293

Special notes for reviewers 🗒️

• Test when the last message is not in the view too (more than 200 new messages), both above and below the current scroll position (ask me if you dont understand what i mean)

unreadMarkerMessageId is the real last message, even if this is not in the view, from this we derive the num of unreads and the "since" currentMarkerMessageId indicates the latest unread message in the view

Additional comments 🎤

• Since we dont have a real pagination in place on the loaded msgs from iridium its easy to determine the num of unreads and the "since". When we'll have real pagination, we'll need to decide how to calculate those info.

[github-actions[bot]]

Download the .APK for this pull request:

• debug-apk.zip

[WanderingHogan]

I think this fixes some issues but there might be one unresolved issue that can go in another ticket

https://user-images.githubusercontent.com/2993032/198585521-36dc9667-6a70-4f45-a66e-ae40de50584a.mov

[phillsatellite]

Besides what @WanderingHogan found above and a small other thing I was able to replicate on dev as well PR was good 🔥

[molimauro]

@WanderingHogan sorry, did you click "reply"?

[phillsatellite]

@molimauro we can obv wait for Hogan to verify but I don't think he did, I tested replies and was all good, replicated bug on my side just by clicking the New Message banner