[PostGIS] #5794: Crash with TopoGeo_addPoint

[PostGIS]

#5794: Crash with TopoGeo_addPoint
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  blocker   |  Milestone:  PostGIS 3.5.1
 Component:  topology  |    Version:  3.4.x
Resolution:            |   Keywords:  crash
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Comment (by strk):

 The crash is due to none of the edges found to be within tolerance using
 lwt_be_getEdgeWithinDistance2D being *closer* than tolerance (which the
 snapping code is using). It can only be reproduced by specifying a
 tolerance which equals exactly the distance from the closest edge.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5794#comment:2>
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