Bug 245613

Description: scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html This iOS consistent failure only happens on the iPad (5th generation) model. The first failure I saw on the dashboard was on 8/27/2022 at 253870@main. As I look at the commits in the range, 253865@main has to do with scrolling and is most likely the cause of the regression. Reproduction steps: I can reproduce this on 253865@main but cannot reproduce it on 253864@main or earlier. Command: run-webkit-tests --ipad-simulator --model 'iPad (5th generation)' --release --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 --no-retry scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html Result: Regressions: Unexpected text-only failures (1) scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html [ Failure ] History: https://results.webkit.org/?suite=layout-tests&test=scrollingcoordinator%2Fios%2Ffixed-in-frame-layer-reconcile-layer-position.html&limit=50000&model=iPad%20(5th%20generation) Diff: --- /Volumes/Data/worker/Apple-iPadOS-16-Simulator-Release-WK2-Tests/build/layout-test-results/scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position-expected.txt +++ /Volumes/Data/worker/Apple-iPadOS-16-Simulator-Release-WK2-Tests/build/layout-test-results/scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position-actual.txt @@ -31,8 +31,13 @@ (children 1 (GraphicsLayer (position 8.00 10.00) - (bounds 200.00 140.00) - (contentsOpaque 1) + (preserves3D 1) + (children 1 + (GraphicsLayer + (bounds 200.00 140.00) + (contentsOpaque 1) + ) + ) ) ) )