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

[PostGIS]

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

 I've further reduced the test to pre-split the incoming line into the 3
 edges that would result by the internal splitting, and added each one in
 turn, until I got the exception.

 Unfortunately I found that even BEFORE ValidateTopology reports an error,
 there is already a clear error, as you can see from this picture, there's
 a "face 2" reported to be on the left and right sides of an edge that
 should have the universe face there instead.

 This means the corruption happens BEFORE ValidateTopology can tell.

 [[Image(screen.png)]]
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6064#comment:5>
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