nz-mention need a '@' with blank as prefix, but ant of react just need '@' as prefix

[Eve-Sama]

Reproduction link

https://stackblitz.com/edit/nz-mention

Steps to reproduce

en: Just input @, you will find nothing's going to happen. But if the text you input is ' @'(with blank), the select panel will appear.

cn: 直接输入@, 没有什么反应, 但是输入空格再输入艾特才会出现选择框.

What is expected?

en: The select panel appears whenever I input @

cn: 每次输入@的时候下拉框都会出现

What is actually happening?

en: The prefix is ' @'(with blank)

cn: 前缀是' @'(带有空格)

Environment	Info
ng-zorro-antd	7.5.1
Browser	Firefox 67.0.3 (64-bit)

---

en: Ant of React does as I expect

cn: Ant of React是直接输入艾特的.

[hsuanxyz]

@Eve-1995 感觉是 react 的 bug，因为没办法输入邮箱了， 上一个版本的 mention 不会出现这个问题 https://ant.design/components/mention-cn/。

[hsuanxyz]

@Eve-1995 ant-design/ant-design#15694, 看来是新行为。

[yxrgds]

Still unsolved?

[Eve-Sama]

Still unsolved?

Yes, it's not a big deal. But it still exist.

[valeriolucantonio]

@Eve-Sama is there any update on this issue? Is there any workaround we can use? I tried to use viewChild to open the dropdown manually but haven't managed so far. It would be cool if you could either deliver a fix or offer a workaround for it.
Thanks
Valerio