EdgeEffect on scrollable controls for touch devices

[msneijders]

Would edge effects for scrollable views, as common on mobile, be considered a part of AvaloniaUI?

I've fiddled up an example implemented as a Decorator -- it emulates androids 'stretching' effect on top of a ListBox: https://github.com/msneijders/ListViewApp.

Probably other and better ways to integrate these effects, like a part of ScrollViewer?