CollectionViewSource.Forms
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Support Picker control by implementing IList
Picker's ItemsSource property is IList instead of IEnumerable. If we use an IList, CollectionViewSource will switch to ListCollectionView anyway, which internally provides an IList. This PR just exposes that externally to make Picker work.
Thanks for the contribution, @chucker! I'm a bit busy this week but I'll review the changes and merge them as soon as possible.