tree-select 子节点使用selectable:false禁止选中后，希望能点击此节点时能展开此节点

[huangxiuqi]

What problem does this feature solve?

现在tree-select组件点击禁止选中的节点时会直接关闭下拉弹出，体验挺不好的，希望能改成如果点击selectable:false的节点，展开此节点，

What does the proposed API look like?

https://stackblitz.com/edit/ng-zorro-antd-start-utfmho?embed=1&file=src/app/app.component.ts
例如上面的例子，点击parent 1节点，会直接关闭下拉框，希望能做成点击parent 1节点时展开parent 1节点

[ng-zorro-bot]

Translation of this issue:

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tree-select Subnodes use selectable:false to disable the selection, you can expand this node when you want to click this node

What problem does this feature solve?

Now when the tree-select component clicks on the disabled node, it will directly close the drop-down popup. The experience is quite bad. I hope that if I click the node with selectable:false, expand this node.

What does the proposed API look like?

Https://stackblitz.com/edit/ng-zorro-antd-start-utfmho?embed=1&file=src/app/app.component.ts
For example, in the above example, clicking on the parent 1 node will directly close the drop-down box, hoping to expand the parent 1 node when clicking the parent node 1

[hsuanxyz]

fixed via ##3843