ItemsRepeater jumps back and forth when scroll to last item using mouse

[hupo376787]

Describe the bug
ItemsRepeater jumps back and forth when scroll to last item using mouse.
Note: this bug not occurs every time, and as the items count varies(go to another repeater), it may behave normal.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Build and run my sample repo
2. Scroll to the last item.

Expected behavior

Scroll to the last item normally.

Screenshots

Version Info

NuGet package version:

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2019 Update (18362)	Yes
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Mobile
Xbox
Surface Hub
IoT

Additional context
Here is a small repo, and special thanks to @XamlBrewer's repo.

[ranjeshj]

@hupo376787 Which version of the OS are you running on ? I cannot repro this on a recent built of windows. If you are running on an older version of the operating system ScrollViewer does not have some of the features to enable Repeater's viewport management features. You will need to wrap it in an ItemsRepeaterScrollHost to make it work there. In more recent versions of the OS ItemsRepeaterScrollHost will no-op and let ScrollViewer do the work. - https://docs.microsoft.com/en-us/uwp/api/microsoft.ui.xaml.controls.itemsrepeaterscrollhost?view=winui-2.2
Hope that helps.

[hupo376787]

Previously I run my app on 1903, but last night my pc update to 1909, so I can't reproduce either.

So I'll keep watching on. Thx.