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

experiment: never compute viewport from screen_top

I think this works!

So the cause of all my trouble was a historical accident: I thought of computing viewport from screen_top before I thought of bring_cursor_of_cursor_pane_in_view. Turning the symbolic dependency DAG of variables into a graph turns out to be no end of trouble, where A sometimes depends on B and B sometimes on A.

Let's see if we uncover any issues.

Created by  Kartik K. Agaram  on January 4, 2023
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