[feature request] tree control does not directly control the API method of expanding / contracting all nodes?
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Description
### Existing Component
Yes
### Component Name
ElTree
### Description
在官网未发现Tree控件有expandAll, shrinkAll类似API，在互联网上搜索发现, 可以使用ref.store._getAllNodes()拿到所有node, 设置node.expanded实现需求. _getAllNodes方法也并未在官网出现。 想知道, 这些API未暴露的原因？类似于这样未暴露的API，官方有统一说法吗？谢谢
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