Ng-zorro-antd: We want nz-sider to overlay the content instead of pushing the content

[IsaacHub]

What problem does this feature solve?

nz-sider needs to have an option to make it overlay on top of existing content instead of pushing that content, while expanding the nz-sider from collapsed state, just like material design

https://stackblitz.com/edit/angular-keztzw

What does the proposed API look like?

A directive like nzBehavior="overlay | push" is better
<nz-sider nzCollapsible nzBehavior="overlay" nzWidth="200px">

It needs to have black overlay, once you click the overlay it should go back to folded state.

[IsaacHub]

It's unbelievable that this simple basic feature is missing in this library.

[duong-le]

You can use NzDrawer to make this happens

[PhilippMatzel]

Is someone working on this issue?