Fork of lines.love where polygons work more like circles with a center and radius

clearing starty is redundant in mutations

We'll end up calling Text.redraw_all anyway, which will clear starty and much more besides.

We'll still conservatively continue clearing starty in a few places where there's a possibility that Text.redraw_all may not be called. This change is riskier than most.

Created by  akkartik  on December 3, 2023
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