NzDropdownService doesn't support create with click event

[wheeljs]

Reproduction link

https://stackblitz.com/edit/angular-snzcmj-q1nxjh

Steps to reproduce

Remove $event.stopPropagation() in contextMenu method at line 41, it seems nothing happened when clicking. But after putting breakpoint in NzDropdownService#create and step into, we can see the dropdown be created and close immediately.

What is expected?

Create and show dropdown correctly, like ng-zorro-antd@7.0.0-rc.3.

stackblitz with ng-zorro-antd@7.0.0-rc.3: https://stackblitz.com/edit/angular-snzcmj-hzlura

What is actually happening?

Dropdown was created and closed immediately.

Environment	Info
ng-zorro-antd	7.1.0
Browser	版本 73.0.3683.86（正式版本） （64 位）

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Sorry for my English.

[vthinkxie]

NzDropdownService is designed for contextmenu event, all click event outside the menu will close it immediately.
it works as design, you can add $event.stopPropagation() just like what you have done in the repro link.