[ScrollArea] `asChild` on `Viewport` is not working correctly

[benoitgrelard]

Bug report

When using asChild on Viewport, the functionality is lost. This is probably due to the fact that there's an extra node around children. I think the solution is to use Slottable probably.

Reproducible example

https://codesandbox.io/s/scrollarea-viewport-aschild-bug-y46g5q?file=/App.js

Suggested solution

Additional context

Your environment

Software	Name(s)	Version
Radix Package(s)
React	n/a
Browser
Assistive tech
Node	n/a
npm/yarn
Operating System