[PostGIS] #5786: Side-location conflict: new edge starts in face 42 and ends in face 10

[PostGIS]

#5786: Side-location conflict: new edge starts in face 42 and ends in face 10
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  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  defect             |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS 3.5.1
 Component:  topology           |    Version:  master
Resolution:                     |   Keywords:  robustness
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Comment (by strk):

 I believe in this specific case we DO get an exception rather than a
 silently invalid topology, is this not the case ?

 Edge merging is required when the floating point grid cannot represent
 distinct intersection points between a line and two almost collinear
 lines. This means that we'd not be moving existing vertices and thus
 should not be breaking existing connections.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5786#comment:10>
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