[PostGIS] #5792: TopoGeo_addPoint silently corrupts topology

[PostGIS]

#5792: TopoGeo_addPoint silently corrupts topology
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 Reporter:  strk      |      Owner:  strk
     Type:  defect    |     Status:  new
 Priority:  high      |  Milestone:  PostGIS 3.5.1
Component:  topology  |    Version:  3.5.x
 Keywords:            |
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 With the new experimental code snapping existing edges to incoming nodes
 there are cases in which attracted edges swap position around a pre-
 existing node. The case at hand was submitted in
 https://trac.osgeo.org/postgis/ticket/5786#comment:4 making this a spin
 off of ticket #5786

 For this ticket we want to either raise an exception OR keep the topology
 valid.

 This only happens from PostGIS-3.5 because prior to that version we never
 snapped existing edges to incoming node other than a single one if found
 to contain the incoming node.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5792>
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