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

undo all optimizations back to commit c6b68678a

Now all we're doing is sticking to 10 columns. Let's see how this goes.

If this goes well then I'll take stock of all the different things I tried and decide which version is cleanest. For example, I'd like to drop either Editable_cursor_pane_updated_screen_top or options.ignore_editable_cursor_pane.

Created by  Kartik K. Agaram  on December 11, 2022
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