[SCM] PostGIS branch stable-3.1 updated. 3.1.11-2-g4425662aa

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- Log -----------------------------------------------------------------
commit 4425662aaaa720f023a0ea8fcc0d348b5f6251d5
Author: Paul Ramsey <pramsey at cleverelephant.ca>
Date:   Thu Feb 29 08:37:42 2024 -0800

    ST_3DDistance error for shared first point, references #5589

diff --git a/NEWS b/NEWS
index 98fa5da00..d4ac31f10 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,8 @@ xxxx/xx/xx
 
 * Bug Fixes *
 
+ - #5589, ST_3DDistance error for shared first point (Paul Ramsey)
+
 
 PostGIS 3.1.11
 2024/02/06
diff --git a/liblwgeom/measures3d.c b/liblwgeom/measures3d.c
index 6f2996be5..49889bf31 100644
--- a/liblwgeom/measures3d.c
+++ b/liblwgeom/measures3d.c
@@ -1155,6 +1155,13 @@ lw_dist3d_seg_seg(POINT3DZ *s1p1, POINT3DZ *s1p2, POINT3DZ *s2p1, POINT3DZ *s2p2
 		dl->twisted = ((dl->twisted) * (-1));
 		return lw_dist3d_pt_seg(s2p1, s1p1, s1p2, dl);
 	}
+	/*s2p1 and s1p1 are the same point */
+	if ((s2p1->x == s1p1->x) && (s2p1->y == s1p1->y) && (s2p1->z == s1p1->z))
+	{
+		dl->distance = 0.0;
+		dl->p1 = dl->p2 = *s2p1;
+		return LW_TRUE;
+	}
 
 	/*
 		Here we use algorithm from softsurfer.com

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

Summary of changes:
 NEWS                   | 2 ++
 liblwgeom/measures3d.c | 7 +++++++
 2 files changed, 9 insertions(+)


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