[BUG] ObservableCollectionAdaptor does remove+add instead of replace

[wilversings]

Describe the bug
ObservableCollectionAdaptor does remove+add instead of replace on the IObservableCollection<?>

Steps To Reproduce

1. Call source.Bind(obsCollection), where source is IObservable<ChangeSet<?>>
2. Listen to obsCollection.CollectionChanged
3. Send a update on source
4. Notice that CollectionChanged raises 2 events for each update on source. One remove and one add

Expected behavior
CollectionChanged should raise just one update event

In a UI context, when binding to a grid, this issue causes the selection to be lost when there are any updates on the selected record.

[github-actions]

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