Fork of lines.love without drawings; useful starting point for further forks

bugfix: page-up

Before this commit it was scrolling up too much. Like, 2 screens up instead of 1.

This commit seems like a follow-up to commits dabb7a6c4 and a9a8d5c17. I'm not analyzing it too much, just focusing on this location after some debug logs.

Those commits should probably have noticed the missing symmetric keystroke. But I'm probably ignoring similar concerns in dealing with this so superficially.

Created by  Kartik K. Agaram  on June 15, 2023
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