[PostGIS] #5862: Postgis topology, silently craating topo edge crosses edge , mixed face labeling in ring

[PostGIS]

#5862: Postgis topology, silently craating topo edge crosses edge , mixed face
labeling in ring
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  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  defect             |     Status:  new
  Priority:  high               |  Milestone:
 Component:  topology           |    Version:  master
Resolution:                     |   Keywords:  robustness
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Changes (by strk):

 * keywords:   => robustness

Comment:

 I've attached a simplified testcase.
 The problem is once again with edge segments being almost concidental but
 not having an intersection, as shown in figure (note the lack of nodes
 near the end point of the incoming offending red line):

 [[Image(case.png)]]

 The incoming line results in a new node and the edge merge code seems to
 be choking on that, but fails to notice it before it is too late!
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5862#comment:2>
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