Serious BUG of Modal about browser's back button

[fuybooo]

I'm submitting a...

[x] Bug report  
[x] Feature request
[ ] Documentation issue or request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Support request => Please do not submit support request here

Current behavior

When I use Modal's service open a modal, then I click the browser's back button, I get a serious BUG! The scroll is hidden!

Expected behavior

The scroll is normal.

Minimal reproduction of the problem with instructions

At https://ng.ant.design/#/components/modal we can see it.

1. click Grid
2. click Modal
3. click '显示对话框'
4. click browser's back button
5. the scroll is hidden!

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z

ng-zorro-antd version: X.Y.Z

Browser:
- [ ] Chrome (desktop) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] IE version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[fuybooo]

When I open a Component Modal , then I click the browser's back button , the modal is still visible.

[fuybooo]

this bug is also existed。

When I open a Component Modal , then I click the browser's back button , the modal is still visible.

[lock]

This thread has been automatically locked because it has not had recent activity. Please open a new issue for related bugs and link to relevant comments in this thread.