From a11ec0f515b86d30e1617e522a2294d3320cb3c7 Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Fri, 23 Apr 2021 14:10:04 +0300
Subject: [PATCH] [bos #24169] [CEA 24168] Error in AffectedElemGroupsInRegion

---
 src/SMDS/SMDS_Mesh.cxx             | 2 +-
 src/SMESH/SMESH_MeshEditor.cxx     | 9 +++++++--
 src/SMESH/SMESH_MesherHelper.hxx   | 2 +-
 src/SMESH_I/SMESH_MeshEditor_i.cxx | 2 +-
 4 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/SMDS/SMDS_Mesh.cxx b/src/SMDS/SMDS_Mesh.cxx
index b01e7c9c4..eaaea6803 100644
--- a/src/SMDS/SMDS_Mesh.cxx
+++ b/src/SMDS/SMDS_Mesh.cxx
@@ -1438,7 +1438,7 @@ int SMDS_Mesh::GetElementsByNodes(const std::vector<const SMDS_MeshNode *>& node
     }
 
   foundElems.clear();
-  if ( n0 )
+  if ( n0 && minNbInverse > 0 )
   {
     foundElems.reserve( minNbInverse );
     SMDS_ElemIteratorPtr eIt = n0->GetInverseElementIterator( type );
diff --git a/src/SMESH/SMESH_MeshEditor.cxx b/src/SMESH/SMESH_MeshEditor.cxx
index 0d5a0a91c..22695bac0 100644
--- a/src/SMESH/SMESH_MeshEditor.cxx
+++ b/src/SMESH/SMESH_MeshEditor.cxx
@@ -10241,7 +10241,8 @@ namespace // automatically find theAffectedElems for DoubleNodes()
       if ( maxX < 0 )
       {
         _elems[0]->setIsMarked( false );
-        _elems[1]->setIsMarked( true );
+        if ( _elems[1] )
+          _elems[1]->setIsMarked( true );
       }
     }
 
@@ -10413,7 +10414,11 @@ namespace // automatically find theAffectedElems for DoubleNodes()
     {
       fissure.reserve( theElemsOrNodes.size() );
       for ( ; elIt != theElemsOrNodes.end(); ++elIt )
+      {
         fissure.push_back( std::move( FissureBorder( *elIt, elemsByFacet )));
+        if ( !fissure.back()._elems[1] )
+          fissure.pop_back();
+      }
     }
     if ( fissure.empty() )
       return;
@@ -10920,7 +10925,7 @@ namespace {
   \brief Identify the elements that will be affected by node duplication (actual duplication is not performed).
   This method is the first step of DoubleNodeElemGroupsInRegion.
   \param theElems - list of groups of elements (edges or faces) to be replicated
-  \param theNodesNot - list of groups of nodes not to replicated
+  \param theNodesNot - list of groups of nodes not to replicate
   \param theShape - shape to detect affected elements (element which geometric center
          located on or inside shape). If the shape is null, detection is done on faces orientations
          (select elements with a gravity center on the side given by faces normals).
diff --git a/src/SMESH/SMESH_MesherHelper.hxx b/src/SMESH/SMESH_MesherHelper.hxx
index 5950ec931..d48318877 100644
--- a/src/SMESH/SMESH_MesherHelper.hxx
+++ b/src/SMESH/SMESH_MesherHelper.hxx
@@ -100,7 +100,7 @@ class SMESH_EXPORT SMESH_MesherHelper
    * \brief Load nodes bound to face into a map of node columns
     * \param theParam2ColumnMap - map of node columns to fill
     * \param theFace - the face on which nodes are searched for
-    * \param theBaseSide - the edges holding nodes on which columns' bases
+    * \param theBaseSide - the edges holding nodes on which columns base
     * \param theMesh - the mesh containing nodes
     * \retval bool - false if something is wrong
    * 
diff --git a/src/SMESH_I/SMESH_MeshEditor_i.cxx b/src/SMESH_I/SMESH_MeshEditor_i.cxx
index 14ed601a6..d96c5c99e 100644
--- a/src/SMESH_I/SMESH_MeshEditor_i.cxx
+++ b/src/SMESH_I/SMESH_MeshEditor_i.cxx
@@ -6671,7 +6671,7 @@ SMESH_MeshEditor_i::DoubleNodeElemGroupsInRegion(const SMESH::ListOfGroups& theE
          duplication is not performed.
   This method is the first step of DoubleNodeElemGroupsInRegion.
   \param theElems - list of groups of elements (edges or faces) to be replicated
-  \param theNodesNot - list of groups of nodes not to replicated
+  \param theNodesNot - list of groups of nodes not to replicate
   \param theShape - shape to detect affected elements (element which geometric center
          located on or inside shape).
          The replicated nodes should be associated to affected elements.