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`ScrollBar`: fully support `__length_hint__` not `Sized` (#863)

* `ScrollBar`: fully support `__length_hint__` not `Sized`

* Convert `__len__` and `__length_hint__` of `ListBox` to properties:
  `AttributeError` will be properly handled by `getattr` / `hasattr`
* Reset to the absolute render way in case of the all contents are expected to be rendered
* better handling of decorated widgets for scrolling

* Update browse example to make scrollbar usage more human-friendly

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Co-authored-by: Aleksei Stepanov <alekseis@nvidia.com>

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