vtkH5PartReader: Reset view before getting global number of items

Spiros Tsalikisrequested to merge
spiros.tsalikis/vtk:fix-h5part-many-timesteps into master

vtkH5PartReader: Reset view before getting global number of items

This MR resolves the VTK side of paraview/paraview#21119 (closed).

Backport: release

Edited by Spiros Tsalikis

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