standardize scroll check in a few places

I'm taking some lessons from pensieve.love here. It seem like specific
pixel thresholds don't matter too much for plain lines.love.

I'd probably feel safer if I just used Text.cursor_out_of_screen in
these places, but it means we draw the screen twice for most events[1].
Let's see if we can get by with the current approach.

[1] Or we have to start scheduling things for the next draw, which is
more complex to orchestrate.

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