Seems useful to know why a layer is composited.
Created attachment 428250 [details] Patch
Comment on attachment 428250 [details] Patch Please fix the test.
Created attachment 428314 [details] Patch
Committed r277358 (237616@main): <https://commits.webkit.org/237616@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 428314 [details].
<rdar://problem/77883097>