FEM: Adopt data extraction for VTK <9.3: different table filter

Additionally remove unneeded includes in c++ code remaining from earlier experiments

src/Mod/Fem/Gui/TaskPostBoxes.cpp

@@ -71,10 +71,6 @@
 #include "ViewProviderFemPostObject.h"
 #include "ViewProviderFemPostBranchFilter.h"
 
-#include <vtkQtTableView.h>
-#include <vtkQtTableModelAdapter.h>
-#include <vtkAttributeDataToTableFilter.h>
-
 using namespace FemGui;
 using namespace Gui;
 

src/Mod/Fem/Gui/TaskPostExtraction.cpp

@@ -37,11 +37,6 @@
 #include <QDialog>
 #include <QVBoxLayout>
 
-#include <vtkTable.h>
-#include <vtkAttributeDataToTableFilter.h>
-#include <vtkSplitColumnComponents.h>
-#include <vtkAbstractArray.h>
-
 #include "ViewProviderFemPostObject.h"
 #include "TaskPostExtraction.h"
 

src/Mod/Fem/femguiutils/data_extraction.py

@@ -33,10 +33,17 @@ from . import vtk_table_view
 
 from PySide import QtCore, QtGui
 
+from vtkmodules.vtkCommonCore import vtkVersion
 from vtkmodules.vtkCommonDataModel import vtkTable
-from vtkmodules.vtkFiltersCore import vtkAttributeDataToTableFilter
 from vtkmodules.vtkFiltersGeneral import vtkSplitColumnComponents
 
+if vtkVersion.GetVTKMajorVersion() > 9 and \
+   vtkVersion.GetVTKMinorVersion() > 3:
+    from vtkmodules.vtkFiltersCore import vtkAttributeDataToTableFilter
+else:
+    from vtkmodules.vtkInfovisCore import vtkDataObjectToTable
+
+
 import FreeCAD
 import FreeCADGui
 
@@ -117,7 +124,13 @@ class DataExtraction(_BasePostTaskPanel):
         if not algo:
             self.data_model.setTable(vtkTable())
 
-        filter = vtkAttributeDataToTableFilter()
+        if vtkVersion.GetVTKMajorVersion() > 9 and \
+            vtkVersion.GetVTKMinorVersion() > 3:
+            filter = vtkAttributeDataToTableFilter()
+        else:
+            filter = vtkDataObjectToTable()
+            filter.SetFieldType(vtkDataObjectToTable.POINT_DATA)
+
         filter.SetInputConnection(0, algo.GetOutputPort(0))
         filter.Update()
         table = filter.GetOutputDataObject(0)