Trre树形控件可优化的建议

[980963894]

Version
1.4.2
Environment
windos10, Chrome@78, Vue@2.6
Steps to reproduce
1.在文档里面Tree组件在不全选的情况下是拿不到它的上层ID的(单选的情况只能拿到单选的ID)
不全选时直接点击 Tree的子节点，应该返回出当前子节点的ID和他的上层(父级ID),我认为这是一个可优化的点
What is expected?
希望在Tree控件使用中 不全选的情况下也可以拿到当前子节点的父级ID
What is actually happening?
并未拿到点击子节点的父级ID 在全选情况下 可以拿到

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