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[feat] Improve ScalarColoringBehavior

Nick Laurenson requested to merge ImproveLiveSourceScalarColoring into master

The rescaling didn't work sometimes with LidarStream, and rescale to [0,0]

The different pieces that could explain that are:

  • the different vtkLidarInterpreter create a initial frame fill with 0, and a scalar array define.
  • the pqPipelineSource::dataUpdate signal could also be send when a filter parameters is modified.

A safe workaround is wait and rescale only if the range isn't [0,0]

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