This is quite different than Damus iOS. The timeline will continually add new items without bumping scroll position, thanks to egui-virtual-list's `items_inserted_at_start` function. Closes: https://github.com/damus-io/notedeck/issues/38 Fixes: https://github.com/damus-io/notedeck/issues/59 Signed-off-by: William Casarin <jb55@jb55.com>