树组件的nzHideUnMatched属性存在bug

[SONASIDANTE]

Reproduction link

https://stackblitz.com/edit/angular-43rgfp?file=src/app/app.component.ts

Steps to reproduce

关闭未匹配搜索节点即可

What is expected?

只是收起

What is actually happening?

没了

Environment	Info
ng-zorro-antd	8.0.2
Browser	无关

---

get displayStyle(): string {
// to hide unmatched nodes
return this.nzSearchValue && this.nzHideUnMatched && !this.nzTreeNode.isMatched && !this.nzTreeNode.isExpanded
? 'none'
: '';
}

[zorro-bot]

Translation of this issue:

There is a bug in the nzHideUnMatched property of the tree component

Reproduction link

[https://stackblitz.com/edit/angular-43rgfp?file=src/app/app.component.ts](https://stackblitz.com/edit/angular-43rgfp?file=src/app/app. Component.ts)

Steps to reproduce

Close the unmatched search node

What is expected?

Just put away

What is actually happening?

Gone

Environment	Info
ng-zorro-antd	8.0.2
Browser	Unrelated

---

  Get displayStyle(): string {
    // to hide unmatched nodes
    Return this.nzSearchValue && this.nzHideUnMatched && !this.nzTreeNode.isMatched && !this.nzTreeNode.isExpanded
      ? 'none'
      : '';
  }