The following layout test is flaky on Mojave WK2 Release and Debug compositing/fixed-with-main-thread-scrolling.html Probable cause: Appears to have been flaky its entire history since its last change in r238883 . Local testing I verified flaky behavior from current revision all the way back to 238883, but flaky behavior did seem to get worse around r244215 but I cannot verify completely since results are very sporadic. Verified with : run-webkit-tests compositing/fixed-with-main-thread-scrolling.html --iter 500 -f Flakiness Dashboard: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=compositing%2Ffixed-with-main-thread-scrolling.html
<rdar://problem/51628629>
Updated expectations in https://trac.webkit.org/changeset/246323/webkit
Created attachment 381037 [details] Patch
Created attachment 381043 [details] Patch
Created attachment 381105 [details] Patch
Created attachment 381218 [details] Patch
Comment on attachment 381218 [details] Patch Clearing flags on attachment: 381218 Committed r251262: <https://trac.webkit.org/changeset/251262>