Unity UI-Elements Scope implementation

UIElements.Scope.cs

namespace UnityEngine.UIElements
{
    public class Scope : IDisposable
    {
        public static VisualElement CurrentRoot { get; private set; }

        public readonly VisualElement root;

        private VisualElement _previousRoot;

        public Scope(VisualElement root)
        {
            if (CurrentRoot != null)
            {
                _previousRoot = CurrentRoot;
                _previousRoot.Add(root);
            }
            CurrentRoot = this.root = root;
        }

        public Scope(VisualElement root, string name) : this(root)
        {
            root.name = name;
        }

        void IDisposable.Dispose()
        {
            CurrentRoot = _previousRoot;
        }

        public void Add(VisualElement child)
        {
            root.Add(child);
        }
    }
}