在popover中使用dropdown组件导致popover不按正常逻辑关闭

[tirelyl]

Reproduction link

https://stackblitz.com/edit/dropdown-in-popover-bug?file=src/app/app.component.ts

Steps to reproduce

在popover中使用dropdown组件，点开dropdown组件后，通过clickoutside的方式关闭dropdown组件，会导致popover组件也被关闭，如图：

What is expected?

关闭popover中的dropdown组件不会导致popover被关闭

What is actually happening?

关闭popover中的dropdown组件会导致popover被关闭

Environment	Info
ng-zorro-antd	10.2.0
Browser	chrome 版本 86.0.4240.198（正式版本） （64 位）

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使用场景为：popover中可能会有下拉列表（dropdown）来选择一些条目，现在的表现为选择过后，popover整个被关闭了

[wzhudev]

@wenqi73 这个应该是去掉 mask 之后点击事件被 disaptch 所有浮层元素导致的，这个有通用的解决方法吗？

[wenqi73]

@wendellhu95 11 会加个nzHasBackdrop 配置项

[tirelyl]

@wendellhu95 11 会加个nzHasBackdrop 配置项

11 大概进度还要多久呀~

[wzhudev]

可关注我们的 milestone https://github.com/NG-ZORRO/ng-zorro-antd/milestone/7

[tirelyl]

#6064 这个pr能解决此问题吗

[suica]

Same problem. Will this be fixed in v10.x?

[maojj]

Same problem， please fix it in v10.x

[wenqi73]

Will fixed in 11.0, you can downgrade to 10.0.2 to avoid this if you use 10.x

[maojj]

Will fixed in 11.0, you can downgrade to 10.0.2 to avoid this if you use 10.x

Our projects are use for 10000+ users ， and every user cost 1+ hours per day。We have to upgrade ng-zorro carefully。 Maybe downgrade to 10.0.2 is a solution，but there are other problems.

1. Some other bugs fixed after 10.0.2，list in https://ng.ant.design/docs/changelog/zh。 If we use 10.0.2 , those bugs will still exist.
2. If this bug fix in 11.0, because 11.0 is a major update, it will have some breaking changes , or some new bugs. We have to wait to a stable version, 11.1.0 or 11.2.0.

So actually，We can not use 10.0.2 in production environment。We have to wait for this bug fixed in 10.x, or wait for 11.1/11.2(not 11.0)