MacOS keyboard smooth scrolling does not scroll recursively on parent scrollable regions
<rdar://problem/95045588>
Pull request: https://github.com/WebKit/WebKit/pull/1480
Committed 251914@main (66e6a77ccc8e): <https://commits.webkit.org/251914@main> Reviewed commits have been landed. Closing PR #1480 and removing active labels.