[SCM] PostGIS branch master updated. 3.7.0rc1-22-g5c6ed8fb7

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- Log -----------------------------------------------------------------
commit 5c6ed8fb748983124d43acd7edde3d36c38abfa0
Author: Sandro Santilli <strk at kbt.io>
Date:   Wed Sep 2 19:46:42 2026 +0200

    Restore edge collapse handling in topology population function
    
    The topology code used lwgeom_make_valid to handle line collapses, but
    that function apparently changed semantic (see #6123 comment 2).
    
    Includes regress test
    
    References #6120 in master branch (3.7.0dev)

diff --git a/liblwgeom/topo/lwgeom_topo.c b/liblwgeom/topo/lwgeom_topo.c
index 11fed9091..5f87eb282 100644
--- a/liblwgeom/topo/lwgeom_topo.c
+++ b/liblwgeom/topo/lwgeom_topo.c
@@ -7245,12 +7245,12 @@ _lwt_AddLineEdge(LWT_TOPOLOGY *topo,
 
     if ( nn ) _lwt_release_nodes(node, nn);
 
-    LWDEBUGG(2, lwline_as_lwgeom(edge), "Snapped after drifted endpoints snap");
+    LWDEBUGG(1, lwline_as_lwgeom(edge), "Snapped after drifted endpoints snap");
 
-    /* make valid, after snap (to handle collapses) */
-    tmp = lwgeom_make_valid(lwline_as_lwgeom(edge));
+    /* node after snap (to handle collapses) */
+    tmp = lwgeom_node(lwline_as_lwgeom(edge));
 
-    LWDEBUGG(2, tmp, "Made-valid after snap to drifted endpoints");
+    LWDEBUGG(1, tmp, "Noded after snap to drifted endpoints");
 
     col = lwgeom_as_lwcollection(tmp);
     if ( col )
diff --git a/topology/test/regress/topogeo_addlinestring.sql b/topology/test/regress/topogeo_addlinestring.sql
index 1f67b7198..caef2a21f 100644
--- a/topology/test/regress/topogeo_addlinestring.sql
+++ b/topology/test/regress/topogeo_addlinestring.sql
@@ -686,3 +686,20 @@ SELECT 't6064.2', count(*) > 0 FROM topology.TopoGeo_addLinestring('t6064',
 )');
 SELECT 't6064.check.final', * FROM topology.ValidateTopology('t6064');
 SELECT NULL FROM topology.DropTopology ('t6064');
+
+
+
+-- See https://trac.osgeo.org/postgis/ticket/6120
+BEGIN;
+SELECT NULL FROM topology.CreateTopology( 't6120' );
+-- Start condition: single closed edge forming very tiny area
+-- TODO: create the starting condition with COPY instead?
+SELECT 't6120.start', topology.TopoGeo_addLinestring('t6120',
+  '01020000000500000010526CDB36DE34406BEE28A10F5451404313671D53DE34404E64FC3B1054514010526CDB36DE34406CEE28A10F545140169A989329DE3440E00C65580F54514010526CDB36DE34406BEE28A10F545140'
+,-1);
+
+-- Incoming: line very similar to the existing one, with just one vertex off by 5.038095382105394e-15
+SELECT 't6120.works', count(*) > 0 FROM topology.TopoGeo_addLinestring('t6120',
+  '0102000000050000004313671D53DE34404E64FC3B10545140169A989329DE3440E00C65580F54514010526CDB36DE34406BEE28A10F545140EBE8402451DE344060A52C31105451404313671D53DE34404E64FC3B10545140'
+,-1);
+ROLLBACK;
diff --git a/topology/test/regress/topogeo_addlinestring_expected b/topology/test/regress/topogeo_addlinestring_expected
index 957ed5f3c..aebefa2c6 100644
--- a/topology/test/regress/topogeo_addlinestring_expected
+++ b/topology/test/regress/topogeo_addlinestring_expected
@@ -243,3 +243,5 @@ t6023.2|errors|
 t6062.edges|t
 t6064.1|t
 t6064.2|t
+t6120.start|1
+t6120.works|t

-----------------------------------------------------------------------

Summary of changes:
 liblwgeom/topo/lwgeom_topo.c                         |  8 ++++----
 topology/test/regress/topogeo_addlinestring.sql      | 17 +++++++++++++++++
 topology/test/regress/topogeo_addlinestring_expected |  2 ++
 3 files changed, 23 insertions(+), 4 deletions(-)


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