[PostGIS] #6064: Silent topology corruption with topology.ST_AddEdgeModFace

[PostGIS]

#6064: Silent topology corruption with topology.ST_AddEdgeModFace
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  reopened
  Priority:  medium    |  Milestone:
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:  robustness
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Comment (by strk):

 It looks like on MacOS winding of a newly formed ring -4 is found to be
 counterclockwise even if we drop the dangling from the computation (on my
 system dropping the dangling changes that, and that ring is found
 clockwise instead):
 https://cirrus-ci.com/task/6517636818796544?logs=test#L1288
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6064#comment:12>
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