[PostGIS] #6129: Missing area with topology.ST_GetFaceGeometry('arstat_2026_overlay_02_348',101383), but alle edges seems to be prensent

[PostGIS]

#6129: Missing area with
topology.ST_GetFaceGeometry('arstat_2026_overlay_02_348',101383), but alle
edges seems to be prensent
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  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  defect             |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS 3.6.5
 Component:  topology           |    Version:  3.6.x
Resolution:                     |   Keywords:
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Comment (by strk):

 Replying to [comment:16 Lars Aksel Opsahl]:
 > Should problem cases like this also be report by ValidateTopology ?

 Only if LineMerge is right, but I can't tell it is, or at least
 ST_IsSimple contraddicts it. Basically what we are seeing is ST_LineMerge
 turning a set of simple and non-intersecting lines into a non-simple one.
 I suspect it's a bug in ST_LineMerge. I'll reduce the testcase.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6129#comment:17>
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