Merge topic 'vtkPLYReader_RGBA_scalar_array_fix'

2d2993db Fix RGBA color scalar array name in vtkPLYReader

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11944

IO/PLY/vtkPLYReader.cxx

@@ -250,7 +250,7 @@ int vtkPLYReader::RequestData(vtkInformation* vtkNotUsed(request),
       rgbCells->SetNumberOfComponents(3);
     }
     output->GetCellData()->AddArray(rgbCells);
-    output->GetCellData()->SetActiveScalars("RGB");
+    output->GetCellData()->SetActiveScalars(rgbCells->GetName());
   }
 
   bool rgbPointsAvailable = false;