[Webkit-unassigned] [Bug 243710] New: REGRESSION (252720 at main): [ iOS ] Four scrollingcoordinator/scrolling-tree/coordinated-frame tests are a consistent failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243710

            Bug ID: 243710
           Summary: REGRESSION (252720 at main): [ iOS ] Four
                    scrollingcoordinator/scrolling-tree/coordinated-frame
                    tests are a consistent failure
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor.html
scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed.html
scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor.html
scrollingcoordinator/scrolling-tree/coordinated-frame.html

The first failure I saw on the dashboard was on 7/21/2022 at 252721 at main.  The four tests are failing with similar diffs.  

REPRODUCTION STEPS
I can reproduce this on 252720 at main but cannot reproduce it on 252719 at main or earlier.

Command: 
run-webkit-tests --ipad-simulator --model 'iPad (5th generation)' --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 --no-retry scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor.html

Result: 
Regressions: Unexpected text-only failures (1)
  scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor.html [ Failure ]

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=scrollingcoordinator%2Fscrolling-tree%2Fcoordinated-frame-gain-scrolling-ancestor.html&test=scrollingcoordinator%2Fscrolling-tree%2Fcoordinated-frame-in-fixed.html&test=scrollingcoordinator%2Fscrolling-tree%2Fcoordinated-frame-lose-scrolling-ancestor.html&test=scrollingcoordinator%2Fscrolling-tree%2Fcoordinated-frame.html&limit=50000&platform=ios&model=iPad%20(5th%20generation)

Diff:
--- /Volumes/Data/worker/Apple-iPadOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
+++ /Volumes/Data/worker/Apple-iPadOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-actual.txt
@@ -10,6 +10,8 @@
   (layout viewport at (0,0) size 800x600)
   (min layout viewport origin (0,0))
   (max layout viewport origin (0,416))
+  (synchronous event dispatch region for event wheel
+    at (45,47) size 404x304)
   (behavior for fixed 0)
   (children 1
     (Fixed node
@@ -31,29 +33,7 @@
               (min layout viewport origin (0,0))
               (max layout viewport origin (0,120))
               (behavior for fixed 0)
-              (children 2
-                (Overflow scrolling node
-                  (scrollable area size 400 300)
-                  (contents size 400 1760)
-                  (scrollable area parameters
-                    (horizontal scroll elasticity 1)
-                    (vertical scroll elasticity 1)
-                    (horizontal scrollbar mode 0)
-                    (vertical scrollbar mode 0)
-                    (allows vertical scrolling 1))
-                  (children 1
-                    (Sticky node
-                      (anchor edges: AnchorEdgeTop AnchorEdgeBottom)
-                      (top offset 10.00)
-                      (bottom offset 10.00)
-                      (containing block rect at (0,0) size 400x1760)
-                      (sticky box rect at (0,830) size 100x100)
-                      (constraining rect at (0,0) size 400x300)
-                      (sticky offset at last layout width=0 height=-640)
-                      (layer position at last layout (0,190))
-                    )
-                  )
-                )
+              (children 1
                 (Sticky node
                   (anchor edges: AnchorEdgeTop AnchorEdgeBottom)
                   (top offset 10.00)

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