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David Thompson authored
This change provides developers with a way to override the `vtkExtractSelection` instance used internally by `vtkConvertSelection`. Also, when processing `QUERY` selections, try to use the externally provided extract-selection filter when converting to index selections. This change allows ParaView (and other applications) to support `vtkSelectionNode`s of type `QUERY`, which VTK does not currently handle. Change-Id: I4a94e393796ae6ea0905895f60a2f62b2c78315d
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