From d2ab9f6c537b5f7fbf0199905f719105b027b1ba Mon Sep 17 00:00:00 2001
From: Matthias Hochsteger <mhochsteger@cerbsim.com>
Date: Fri, 7 Oct 2022 17:01:40 +0200
Subject: [PATCH] Fix in 2d edge swapping: Don't consider Segments for swapping

---
 libsrc/meshing/improve2.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libsrc/meshing/improve2.cpp b/libsrc/meshing/improve2.cpp
index c46df8a0..54c15f89 100644
--- a/libsrc/meshing/improve2.cpp
+++ b/libsrc/meshing/improve2.cpp
@@ -284,6 +284,8 @@ namespace netgen
             {
               PointIndex pi1 = sel.PNumMod(j+2);
               PointIndex pi2 = sel.PNumMod(j+3);
+              if(mesh.IsSegment(pi1, pi2))
+                  continue;
 
               for (auto sei_other : elements_on_node[pi1])
                 {