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Tested with master build, MacOS

@sebastien.jourdain @yohann.bearzi I am unable to write .phtg's with the current paraview master branch.

To reproduce:

• Open paraview
• Sources -> Hyper Tree Grid (random) -> Apply
• File -> Save as phtg with default settings

I get the error:

(  20.623s) [paraview        ]vtkDemandDrivenPipeline:813    ERR| vtkPVCompositeDataPipeline (0x7f84e25c7db0): Input for connection index 0 on input port index 0 for algorithm vtkPassSelectedArrays(0x7f84e208be60) is of type vtkHyperTreeGrid, but a vtkDataSet is required.

I added this to vtkPassArrays. It seemed to work, but I'm not sure if it's the right fix...

    info->Append(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkHyperTreeGrid");