* Endless scrolling in a chat view
- scroll position when you open keyboard/change screen orientation will remain the same
- scrolling to top will show messages from history
- unread messages will be positioned at the top of the screen
* Marking chat read message-per-message
* Prevent changing scroll position on orientation change
* Adapted new code to the old code
* refactor
Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>
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