[PostGIS] #5872: CG_StraightSkeletonPartition should return a geometry collection instead of a multipolygon

[PostGIS]

#5872: CG_StraightSkeletonPartition should return a geometry collection instead of
a multipolygon
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 Reporter:  robe    |      Owner:  lbartoletti
     Type:  defect  |     Status:  new
 Priority:  medium  |  Milestone:  PostGIS 3.6.0
Component:  sfcgal  |    Version:  master
 Keywords:          |
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 The CG_StraightSkeletonPartition returns an invalid MULTIPOLYGON cause
 obviously the edges touch at the Straight Skeleton.

 It should instead return a set of polygons or a Geometry Collection.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5872>
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