We have a preferred size for fullscreen windows, and then we try to fit video into that size. But if the video is an unusual aspect ratio, we can accidentally create windows that escape the bounds.
<rdar://problem/101439923>
https://github.com/WebKit/WebKit/pull/5647
Committed 255857@main (1626a43b85c9): <https://commits.webkit.org/255857@main> Reviewed commits have been landed. Closing PR #5647 and removing active labels.