根据 GetCustomRowHeight 返回的高度,刷新自定义行矩形的缓存。
此方法会针对每个当前行调用 GetCustomRowHeight 并缓存结果。在系统调用 BuildRows 后,TreeView 会自动调用此方法以确保高度与行保持同步。当行高发生动态变化时(例如用户操作改变了行内容),需要手动调用此方法。
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