[postgis-tickets] [PostGIS] #5105: False topology invalidity returned in presence of dangling edgerings

[PostGIS]

#5105: False topology invalidity returned in presence of dangling edgerings
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.3.0
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:  reliability
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Comment (by strk):

 I filed #5107 for tthe ST_Area issue. As for this case, here's an example
 flat polygon found to be CCW by ST_IsPolygonCCW:
 {{{
 =# select ST_IsPolygonCCW('
 POLYGON((
   29.262792863298348 71.22115103790775,
   29.26598031986849  71.22202978558047,
   29.275379947735576 71.22044935739267,
   29.29461024331857  71.22741507590429,
   29.275379947735576 71.22044935739267,
   29.26598031986849  71.22202978558047,
   29.262792863298348 71.22115103790775
 ))
 ');
  st_ispolygonccw
 -----------------
  t
 (1 row)
 }}}

 The cause could be the same (winding computed using signed area)

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5105#comment:9>
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