Ellipse-to-arc conversion creates tiny floating-point gaps (~0.00002")
between consecutive arc segments. ShapeBuilder chains these with
ChainTolerance (0.0001"), but ConvertGeometry checked gaps with Epsilon
(0.00001"). Gaps between these thresholds generated spurious rapid moves
that broke GraphicsPath figures, causing diagonal fill artifacts from
GDI+'s implicit figure closing.
Root cause fix: align ConvertGeometry's gap check with ShapeBuilder's
ChainTolerance so precision gaps are absorbed instead of generating rapids.
Defense-in-depth: GraphicsHelper no longer breaks figures at near-zero
rapids, protecting against any programs with residual tiny rapids.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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