(cherry picked from commit d2681a122cd708f8ddb5c75005b6b2aa30c5f844)

src/SMESH/SMESH_Mesh.cxx

@@ -1191,11 +1191,11 @@ void SMESH_Mesh::NotifySubMeshesHypothesisModification(const SMESH_Hypothesis* h
   if ( !GetMeshDS()->IsUsedHypothesis( hyp ))
     return;
 
-  bool toCallBack = true;
+  int nbEntities = ( _myMeshDS->NbNodes() + _myMeshDS->NbElements() );
-  if ( _callUp && hyp && NbNodes() == 0 ) // for not loaded mesh (#16648)
+  if ( hyp && _callUp && !_callUp->IsLoaded() ) // for not loaded mesh (#16648)
   {
-    _callUp->HypothesisModified( hyp->GetID() );
+    _callUp->HypothesisModified( hyp->GetID(), /*updateIcons=*/true );
-    toCallBack = ( NbNodes() > 0 );
+    nbEntities = ( _myMeshDS->NbNodes() + _myMeshDS->NbElements() ); // after loading mesh
   }
 
   SMESH_Algo *algo;
@@ -1265,8 +1265,9 @@ void SMESH_Mesh::NotifySubMeshesHypothesisModification(const SMESH_Hypothesis* h
   HasModificationsToDiscard(); // to reset _isModified flag if mesh becomes empty
   GetMeshDS()->Modified();
 
-  if ( _callUp && hyp && toCallBack )
+  int newNbEntities = ( _myMeshDS->NbNodes() + _myMeshDS->NbElements() );
-    _callUp->HypothesisModified( hyp->GetID() );
+  if ( hyp && _callUp )
+    _callUp->HypothesisModified( hyp->GetID(), newNbEntities != nbEntities );
 }
 
 //=============================================================================

src/SMESH/SMESH_Mesh.hxx

@@ -334,9 +334,10 @@ class SMESH_EXPORT SMESH_Mesh
 
   struct TCallUp // callback from SMESH to SMESH_I level
   {
-    virtual void RemoveGroup (const int theGroupID)=0;
+    virtual void RemoveGroup( const int theGroupID )=0;
-    virtual void HypothesisModified (int theHypID)=0;
+    virtual void HypothesisModified( int hypID, bool updateIcons )=0;
-    virtual void Load ()=0;
+    virtual void Load()=0;
+    virtual bool IsLoaded()=0;
     virtual ~TCallUp() {}
   };
   void SetCallUp( TCallUp * upCaller );

src/SMESH_I/SMESH_Gen_i.hxx

@@ -523,6 +523,7 @@ public:
                                       const char*            theName = 0);
   void UpdateIcons(SMESH::SMESH_Mesh_ptr theMesh);
   void HighLightInvalid(CORBA::Object_ptr theObject, bool isInvalid);
+  bool IsInvalid(SALOMEDS::SObject_ptr theObject);
   bool AddHypothesisToShape(SMESH::SMESH_Mesh_ptr       theMesh,
                             GEOM::GEOM_Object_ptr       theShapeObject,
                             SMESH::SMESH_Hypothesis_ptr theHyp);

src/SMESH_I/SMESH_Gen_i_1.cxx

@@ -1030,6 +1030,28 @@ void SMESH_Gen_i::highLightInvalid( SALOMEDS::SObject_ptr theSObject, bool isInv
   }
 }
 
+//=======================================================================
+//function : IsInvalid
+//purpose  : Check object validity == absence of AttributeTextColor=(178,34,34)
+//=======================================================================
+
+bool SMESH_Gen_i::IsInvalid( SALOMEDS::SObject_ptr theSObject )
+{
+  bool isValid = true;
+  if ( !theSObject->_is_nil() )
+  {
+    SALOMEDS::GenericAttribute_wrap attr;
+    SALOMEDS::StudyBuilder_var studyBuilder = getStudyServant()->NewBuilder();
+    if ( studyBuilder->FindAttribute( theSObject, attr.inout(), "AttributeTextColor" ))
+    {
+      SALOMEDS::AttributeTextColor_wrap colorAttr = attr;
+      SALOMEDS::Color color = colorAttr->TextColor();
+      isValid = ( color.R != 178 || color.G != 34 || color.B != 34 );
+    }
+  }
+  return isValid;
+}
+
 //=======================================================================
 //function : GetMeshOrSubmeshByShape
 //purpose  : 

src/SMESH_I/SMESH_Mesh_i.cxx

@@ -113,6 +113,7 @@ SMESH_Mesh_i::SMESH_Mesh_i( PortableServer::POA_ptr thePOA,
   _impl          = NULL;
   _gen_i         = gen_i;
   _id            = _idGenerator++;
+  _nbInvalidHypos= -1;
   _editor        = NULL;
   _previewEditor = NULL;
   _preMeshInfo   = NULL;
@@ -647,6 +648,8 @@ SMESH_Mesh_i::AddHypothesis(GEOM::GEOM_Object_ptr       aSubShape,
   if ( _preMeshInfo )
     _preMeshInfo->ForgetOrLoad();
 
+  const int prevNbMeshEnt = _impl->NbNodes() + _impl->GetMeshDS()->NbElements();
+
   std::string error;
   SMESH_Hypothesis::Hypothesis_Status status = addHypothesis( aSubShape, anHyp, &error );
   anErrorText = error.c_str();
@@ -655,7 +658,10 @@ SMESH_Mesh_i::AddHypothesis(GEOM::GEOM_Object_ptr       aSubShape,
   if ( !SMESH_Hypothesis::IsStatusFatal(status) )
   {
     _gen_i->AddHypothesisToShape( mesh, aSubShape, anHyp );
-    _gen_i->UpdateIcons( mesh );
+
+    int newNbMeshEnt = _impl->NbNodes() + _impl->GetMeshDS()->NbElements();
+    if ( newNbMeshEnt != prevNbMeshEnt )
+      _gen_i->UpdateIcons( mesh );
   }
   if(MYDEBUG) MESSAGE( " AddHypothesis(): status = " << status );
 
@@ -3072,40 +3078,55 @@ namespace
     SMESH_Mesh_i* _mesh;
     TCallUp_i(SMESH_Mesh_i* mesh):_mesh(mesh) {}
     virtual void RemoveGroup (const int theGroupID) { _mesh->removeGroup( theGroupID ); }
-    virtual void HypothesisModified (int theHypID)  { _mesh->onHypothesisModified( theHypID ); }
+    virtual void HypothesisModified( int hypID,
+                                     bool updIcons) { _mesh->onHypothesisModified( hypID,
+                                                                                   updIcons ); }
     virtual void Load ()                            { _mesh->Load(); }
+    virtual bool IsLoaded()                         { return _mesh->IsLoaded(); }
   };
 }
 
 //================================================================================
 /*!
- * \brief callback from _impl to forget not loaded mesh data (issue 0021208)
+ * \brief callback from _impl to
+ *     1) forget not loaded mesh data (issue 0021208)
+ *     2) mark hypothesis as valid
  */
 //================================================================================
 
-void SMESH_Mesh_i::onHypothesisModified(int theHypID)
+void SMESH_Mesh_i::onHypothesisModified(int theHypID, bool theUpdateIcons)
 {
   if ( _preMeshInfo )
     _preMeshInfo->ForgetOrLoad();
 
-  SMESH::SMESH_Mesh_var mesh = _this();
+  if ( theUpdateIcons )
-  _gen_i->UpdateIcons( mesh );
-
-  // mark a hypothesis as valid after edition
-  SALOMEDS::SComponent_wrap smeshComp = _gen_i->PublishComponent();
-  SALOMEDS::SObject_wrap hypRoot;
-  if ( !smeshComp->_is_nil() && 
-       smeshComp->FindSubObject( _gen_i->GetHypothesisRootTag(), hypRoot.inout() ))
   {
-    SALOMEDS::ChildIterator_wrap anIter = _gen_i->getStudyServant()->NewChildIterator( hypRoot );
+    SMESH::SMESH_Mesh_var mesh = _this();
-    for ( ; anIter->More(); anIter->Next() )
+    _gen_i->UpdateIcons( mesh );
+  }
+
+  if ( _nbInvalidHypos != 0 )
+  {
+    // mark a hypothesis as valid after edition
+    int nbInvalid = 0;
+    SALOMEDS::SComponent_wrap smeshComp = _gen_i->PublishComponent();
+    SALOMEDS::SObject_wrap hypRoot;
+    if ( !smeshComp->_is_nil() &&
+         smeshComp->FindSubObject( _gen_i->GetHypothesisRootTag(), hypRoot.inout() ))
     {
-      SALOMEDS::SObject_wrap    hypSO = anIter->Value();
+      SALOMEDS::ChildIterator_wrap anIter = _gen_i->getStudyServant()->NewChildIterator( hypRoot );
-      CORBA::Object_var           obj = _gen_i->SObjectToObject( hypSO );
+      for ( ; anIter->More(); anIter->Next() )
-      SMESH::SMESH_Hypothesis_var hyp = SMESH::SMESH_Hypothesis::_narrow( obj );
+      {
-      if ( !hyp->_is_nil() && hyp->GetId() == theHypID )
+        SALOMEDS::SObject_wrap    hypSO = anIter->Value();
-        _gen_i->HighLightInvalid( hyp, false );
+        CORBA::Object_var           obj = _gen_i->SObjectToObject( hypSO );
+        SMESH::SMESH_Hypothesis_var hyp = SMESH::SMESH_Hypothesis::_narrow( obj );
+        if ( !hyp->_is_nil() && hyp->GetId() == theHypID )
+          _gen_i->HighLightInvalid( hyp, false );
+        else
+          nbInvalid += _gen_i->IsInvalid( hypSO );
+      }
     }
+    _nbInvalidHypos = nbInvalid;
   }
 }
 

src/SMESH_I/SMESH_Mesh_i.hxx

@@ -452,11 +452,9 @@ public:
   const std::map<int, SMESH::SMESH_GroupBase_ptr>& getGroups() { return _mapGroups; }
   // return existing group objects
 
-  void onHypothesisModified(int theHypID);
+  void onHypothesisModified(int theHypID, bool updateIcons);
   // callback from _impl to forget not loaded mesh data (issue 0021208)
 
-  void checkMeshLoaded();
-
   /*!
    * \brief Update data if geometry changes
    *
@@ -724,12 +722,13 @@ private:
    */
   TListOfListOfInt findConcurrentSubMeshes();
 
-private:
+ private:
 
   static int    _idGenerator;
   ::SMESH_Mesh* _impl;        // :: force no namespace here
   SMESH_Gen_i*  _gen_i;
   int           _id;          // id given by creator (unique within the creator instance)
+  int           _nbInvalidHypos;
   std::map<int, SMESH::SMESH_subMesh_ptr>    _mapSubMeshIor;
   std::map<int, SMESH::SMESH_GroupBase_ptr>  _mapGroups;
   std::map<int, SMESH::SMESH_Hypothesis_ptr> _mapHypo;