scrolling tests

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goals:
initial state:
* keep scrollbar at bottom while new messages are added to bottom
* keep scrollbar at bottom while old messages purged from top
* keep scrollbar at bottom while window resized
if user scrolls up:
* keep central message location consistent while new messages added to bottom
* keep central message location consistent while new messages purged from top
* keep central message location consistent while window resized
* scroll back to bottom after a reasonable period of no activity (1 minute?)

scrolling tests

log