[PostGIS] #5654: Missing line segment with self-intersection and MVT

[PostGIS]

#5654: Missing line segment with self-intersection and MVT
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  Reporter:  mhkeller  |      Owner:  pramsey
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.4.3
 Component:  postgis   |    Version:  3.4.x
Resolution:            |   Keywords:  mvt, self-intersection
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Comment (by pramsey):

 Hm, manifests in a fun performance optimization, and gives the right
 answer if that optimization is removed.

 https://github.com/postgis/postgis/blame/1d12c312bdb2b7d900a01d0259b1f1259edf211d/liblwgeom/ptarray.c#L1667
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5654#comment:7>
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