| existing | 要保持的现有对象，如果是 null 则创建新对象。如果未找到保持的状态，将原样返回非 null 对象。 |
| key | 当前 VisualElement 的键，要用于 EditorWindow 上的持久性存储。 |
T 传入的相同对象（如果传入 null，则为新对象），但可能恢复其持久状态。
引用现有的持久化对象和键，返回以保持的状态填充的对象或原样返回对象。
引用现有的（或 null）持久化对象和键（理想情况是从 VisualElement.GetFullHierarchicalPersistenceKey 引用），返回用保持的状态填充的对象或原样返回对象。如果传入 null 并且未找到保持的状态，还会创建一个新的持久化对象。此函数不会向 EditorWindow 上的持久性存储中保存任何内容。
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