From 222d596e3b02ce4db0284c92cfeb464a36367b3d Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Mon, 28 Sep 2020 14:18:24 +0300
Subject: [PATCH] #19993 [CEA 17873] Delete group with contents crash

---
 src/SMESH_I/SMESH_Mesh_i.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/SMESH_I/SMESH_Mesh_i.cxx b/src/SMESH_I/SMESH_Mesh_i.cxx
index 97687ae79..fd26d1cf0 100644
--- a/src/SMESH_I/SMESH_Mesh_i.cxx
+++ b/src/SMESH_I/SMESH_Mesh_i.cxx
@@ -1212,6 +1212,9 @@ void SMESH_Mesh_i::RemoveGroupWithContents( SMESH::SMESH_GroupBase_ptr theGroup
       if ( n->NbInverseElements() == 0 )
         _impl->GetMeshDS()->RemoveFreeNode( n, /*sm=*/0 );
 
+  _impl->GetMeshDS()->Modified();
+  _impl->SetIsModified( true );
+
   // Update Python script (theGroup must be alive for this)
   pyDump << SMESH::SMESH_Mesh_var(_this())
          << ".RemoveGroupWithContents( " << theGroup << " )";