[flatten] Render an "evolute patch" when an offset curve has a cusp in it #607
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Add the GPU logic for patching up unfilled cutouts that emerge when a stroke offset curve has a cusp near a high curvature zone in the source curve. The patch is bounded by the evolutes of the intermediate Euler spiral segments as described in Nehab20 and GPU-friendly Stroke Expansion (see particular Figure 7)
This also adds new test scenes that demonstrate the effect.