Client for playing 300 publicly available Sokoban puzzles on a computer or phone.

bugfix: recompute screen lines in backspace/delete

Scenario: backspacing until a line takes up fewer screen lines, then pressing down.

I've gone through and checked that fragments and screen_line_starting_pos are now cleared together everywhere.

Created by  Kartik K. Agaram  on June 23, 2022
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