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BUG #15503: Fix collection information about field data arrays.

Utkarsh Ayachit requested to merge utkarsh.ayachit/paraview:15503_fix_vtkBlockColors_in_parallel into master

When collecting information about field data arrays in parallel, we accumulated the number of tuples by simply adding them. This resulted in vtkSMArrayListDomain::FieldArrayHasOneTuplePerCompositeDataSetLeaf() check to fail. This check limits which field-data arrays are shown in the color-by drop-down box. This commit fixes the number of tuples accumulation logic to use the max value for FieldData arrays instead of sum. This is reasonable for the way field data is reduced in parallel when rendering on the client process.

Fixes BUG #15503

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