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BUG: Fix NumberOfItems value when observing vtkCollection

Csaba Pinter requested to merge cpinter/vtk:collection-modified-numberofitems-bug into master

The Modified event was emitted before updating the NumberOfItems member in vtkCollection AddItem and InsertItem. This resulted in accessing an outdated NumberOfItems value when observing Modified event on vtkCollection. Fixed by emitting Modified event last.

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