Merge topic 'vtkGradientFilter-fix-cell-option-removal'

23d4032f vtkGradientFilter: Fix accidental removal of setting cellOption

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11952

Filters/General/vtkGradientFilter.cxx

@@ -423,6 +423,7 @@ struct PointGradients : public GradientsBase<TData>
     , Links(links)
     , MaxSpatialDimension(
         cellOption == vtkGradientFilter::DataSetMax ? input->GetMaxSpatialDimension() : 0)
+    , CellOption(cellOption)
   {
   }