Paginator that uses all available screen/window width

exclude left margin from my word-split heuristic

Gratifying how few tests need changing. Recent commits seem on the right track.

Created by  Kartik K. Agaram  on July 20, 2022
3OC7AIC7B6XFGODWNAOSQ25YQ27RUEBNHUVZG6U2PK3CXV7Y7GHAC
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