[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 Lars Aksel Opsahl):

 So with that new merge line code I assume lines may be merged into a
 single line ?

 Just like what happens when I define the topology.CreateTopology
 ('t5786',4258,1e-04); the two lines are merge into one and we get no
 error.

 One issue is how handle bleeding polygons.

 We could off always add closed polygons , but that's not possible since we
 polygons that may cover many content based grid cells.

 So If endpoints of a line connecting to another cell has been moved we
 will not be able connect them.

 What happens if we disable the new line merge code ?
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5786#comment:7>
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