How antv-tree expands all under lazy loading

[2016011969sunyifang]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

想要一个展开全部的功能 通过按钮点击实现树的展开全部 目前米有找到什么好的方法 直接赋值会引发节点刷新的问题

What does the proposed API look like?

给一个属性暴露出来 如果为true则自动站看 据我所知现在的expendAll只能在初始化时候应用

[tangjinzhou]

受控模式，同过 expandKeys 展开

[github-actions]

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