A polygon, a polyline, a curve or a connector's elbow used to be dropped
with a warning; it now rides the box as an SVG path in the 0…100 box a
preset's points use, and the editor draws it. Read from all four dialects
the two products write (ODF points and svg:d, a non-primitive
enhanced-path, DrawingML custGeom, VML's reversed-case path), written
back as enhanced-path and custGeom — LibreOffice renders both exactly as
the editor draws them. An open outline is stroked, never filled.
