SALOME Forum bug: sub-mesh removal leads to an Exception in a re-opened study.

+  void                      UnRegisterFilters();

src/SMESHGUI/SMESHGUI_FilterDlg.cxx

@@ -1970,6 +1970,10 @@ void SMESHGUI_FilterTable::onCriterionChanged (const int row, const int col, con
   {
     isThresholdEditable = true;
   }
+  if ( !isThresholdEditable )
+  {
+    aTable->setItem( row, 2, new QTableWidgetItem() );
+  }
   aTable->setEditable( isThresholdEditable, row, 2);
 
 
@@ -3323,6 +3327,8 @@ bool SMESHGUI_FilterDlg::createFilter (const int theType)
     aCriteria[ i ] = aCriterion;
   }
 
+  if ( !myFilter[ theType ]->_is_nil() )
+    myFilter[ theType ]->UnRegister();
   myFilter[ theType ] = aFilterMgr->CreateFilter();
   myFilter[ theType ]->SetCriteria(aCriteria.inout());
 
@@ -3356,9 +3362,29 @@ SMESH::Filter_var SMESHGUI_FilterDlg::GetFilter() const
 
 void SMESHGUI_FilterDlg::SetFilter(SMESH::Filter_var filter, int type)
 {
+  if ( !filter->_is_nil() )
+    filter->Register();
+  if ( !myFilter[ type ]->_is_nil() )
+    myFilter[ type ]->UnRegister();
+
   myFilter[ type ] = filter;
 }
 
+//================================================================================
+/*!
+ * \brief call UnRegister() for myFilter's
+ */
+//================================================================================
+
+void SMESHGUI_FilterDlg::UnRegisterFilters()
+{
+  QMap< int, SMESH::Filter_var >::iterator i_f = myFilter.begin();
+  for ( ; i_f != myFilter.end(); ++i_f )
+    if ( !i_f.value()->_is_nil() )
+      i_f.value()->UnRegister();
+  myFilter.clear();
+}
+
 //=======================================================================
 // name    : SMESHGUI_FilterDlg::insertFilterInViewer
 // Purpose : Insert filter in viewer

src/SMESHGUI/SMESHGUI_FilterDlg.h

@@ -234,6 +234,7 @@ public:
 
   SMESH::Filter_var         GetFilter() const;
   void                      SetFilter(SMESH::Filter_var filter, int type);
+  void                      UnRegisterFilters();
 
 signals: