allow to specify the backdrop parent for the modal component

[Johann-S]

Hi everybody!
I hope you're doing well, I wish you the best for this new year!

A small PR, to allow to specify the root element for the modal backdrop, it can be useful for users who use Bootstrap with Gatsby for example

Edit: The build failed on something I didn't changed, that's strange 🤔

[GeoSot]

Hello @Johann-S 😃

Can you please help me to understand how can it help Gatsby users?

We had another PR trying to introduce a modal option, defining rootParent and inherit it to backdrop. I believe this option would be more handy, without exposing backdrop rootParent option.

In case I am right and we provide the modal rootParent option, does this PR add any value to functionality?

Ps: would appreciate your help/response on #34989 (comment)

[Johann-S]

Hey :)

Finally after some tests on my project, it's because of purgeCSS remove .modal-backdrop added by our JS.
So feel free to close that PR if it's not useful 👌

[XhmikosR]

So, do we need this after all?

[Johann-S]

Nope I don't think it's useful at all 😆