experimental fork of lines.love for CJK support

clean up a slight jitter when drawing circles

Earlier the ghost while drawing wouldn't quite match the final shape. Now the math is identical in draw_pending_shape.

It's a little unfortunate that we have this duplication of formulae.

At least there are no other stray calls of App.mouse_x in draw_pending_shape.

Created by  Kartik K. Agaram  on September 15, 2023
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