About the usage of tree-view trackBy attribute

[lycHub]

Reproduction link

https://stackblitz.com/edit/angular-xdjeqe?file=src/app/app.component.ts

Steps to reproduce

Click the remove button at the top to delete the last node

What is expected?

Delete the last node, the arrow of its parent node disappears

What is actually happening?

The arrow of its parent node will not disappear

Environment	Info
ng-zorro-antd	12.1.0
Browser	edge

---

In order to prevent washing the entire tree every time, I used the trackBy attribute

[plakyda-codefresh]

@lycHub, @hsuanxyz prepared PR for this issue
PR