[Feature] ListViewExtensions to customize item margin and corner radius

[huynhsontung]

Describe the problem

ListViewItem has a hardcoded margin and corner radius.

The corner radius is always 2

Customize corner radius to 8

The margin is always 2,4,2,4. Note that this is the margin between the item and the scrollviewer and cannot be set by overriding ListViewItem style

This is after the margin has been set to 0,2,0,2

Describe the solution

Add ItemCornerRadius and ItemMargin attached properties to ListViewExtensions

Alternatives

No response

Additional info

Retemplating ListViewItem doesn't work since ListViewItemPresenter does not respect CornerRadius or Padding/Margin

Help us help you

Yes, I'd like to be assigned to work on this item.

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