Add wrapperRender method to Modal component

[vileven]

This PR contains new method to Modal component. It's usefull for me adding wrapper to Modal component (including backdrop), so I just forked and add some

[jquense]

Hi, thanks for the PR. I'm not sure i understand what this adds or unlocks. You can already control the rendering of each as well as the portal container

[vileven]

Hi, thanks for the PR. I'm not sure i understand what this adds or unlocks. You can already control the rendering of each as well as the portal container

I need to have a wrapper, due to the design of my modals (I think it doesn't really matters why. But in case you're interested, it's because they have to add a scrollbar if they don't fit on the page).

Each modal should have a wrapper...

and of course, I can use container. But in that container, I should implement container prop pretty similar inside this library. And I get a very complex structure with two ReactDOM.createPortal and so on. So, I decided to fork library and add wrapper here.

[jquense]

thoughts folks?

[kyletsang]

Hmm I'm not sure about this. I'm thinking it should be possible to handle the scrolling using the current rendering API, but maybe it's easier to visualize with an example?