Fix incorrect cast in TreeSelectionModelBase #282
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`GetChildren` is typed as an `IEnumerable<T>` but we were casting it to an `IReadOnlyList<T>`. Handle an actual enumerable being returned.
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GetChildrenis typed as anIEnumerable<T>but we were casting it to anIReadOnlyList<T>. This works for most cases, but we're not respecting the API.This PR changes the code to handle the case where an actual enumerable is returned.