compositing/transforms/perspective-with-scrolling.html is frequently failing on Mojave Debug WK2 Image diff shows that the expected scroll bars & gutters are not present: https://build.webkit.org/results/Apple%20Mojave%20Debug%20WK2%20(Tests)/r261699%20(9580)/compositing/transforms/perspective-with-scrolling-diffs.html https://results.webkit.org/?suite=layout-tests&test=compositing%2Ftransforms%2Fperspective-with-scrolling.html
<rdar://problem/63239346>
This test was just added yesterday with https://trac.webkit.org/changeset/261632/webkit
Scrollbar differences.
I can reproduce. Toggling overlay scrollbars must have some asynchrony somehow.
Created attachment 399452 [details] Patch
Attempt to de-flake: https://trac.webkit.org/changeset/261730/webkit
Seems to have worked.