[PostGIS] #5862: TopoGeo_add* silently corrupt topology: edge crosses edge, mixed face labeling in ring

[PostGIS]

#5862: TopoGeo_add* silently corrupt topology: edge crosses edge, mixed face
labeling in ring
--------------------------------+------------------------
  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  defect             |     Status:  new
  Priority:  high               |  Milestone:
 Component:  topology           |    Version:  master
Resolution:                     |   Keywords:  robustness
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Comment (by Lars Aksel Opsahl):

 Replying to [comment:12 strk]:
 > I'm experimenting with using the GEOS 3.9 Precision overlay operations.
 >

 Nice to test that.

 > Looks promising in that it would (at least in this case) avoid ending up
 with the initial state of having those internal vertices of edge2 so close
 to edge1 segment.
 >

 Nice

 > Current master branch of PostGIS still only requires 3.8 so we'd have a
 mix of behaviors if we rely on that, but the advantages might out weight
 the disadvantages.
 >
 > WIP PR for that: https://git.osgeo.org/gitea/postgis/postgis/pulls/243
 >
 > Still we should probably run some checks to avoid creating invalid
 topologies as the biggest priority.
 >

 Totally agree that main focus should be to avoid topology errors.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5862#comment:13>
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