Add support for read markers
Remaining issues:
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Fill out commit description -
Figure out a good way to detect that you're "at the top", currently you can press on the read marker to make it go away but that's not great UX. -
It's still possible for the websocket-backed posts to appear in the timeline, even when you're not caught up -
The "read more" message needs a separator line -
Rewrite the m_prev/m_next logic (see FIXME) if I have the time, it's horrible
Edited by Joshua Goins