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vtkContourFilter uses several specialized subfilters depending on the input data type to perform the contouring. However, the progress from these subfilters wasn't pushed through the vtkContourFilter object. This patch installs an observer on the subfilter and properly updates vtkContourFilter's progress. The work for this patch has been sponsored by BP. Change-Id: I849b442318b0a59a64099add2fa6ccd74967725a
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