[Webkit-unassigned] [Bug 194253] New: [ Mac WK2 ] Regression Layout Test scrollingcoordinator/scrolling-tree/fixed-inside-frame.html is flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194253

            Bug ID: 194253
           Summary: [ Mac WK2 ] Regression Layout Test
                    scrollingcoordinator/scrolling-tree/fixed-inside-frame
                    .html is flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac WK2

scrollingcoordinator/scrolling-tree/fixed-inside-frame.html

Probable cause:

Test starts to be a flaky failure in build https://trac.webkit.org/changeset/240713/webkit

Test was modified in 240548

Tests conducted from 240548 to build 240712 result in 100% failure

Reproduced with:

run-webkit-tests --root t240713 scrollingcoordinator/scrolling-tree/fixed-inside-frame.html --iterations 50 -f

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=scrollingcoordinator%2Fscrolling-tree%2Ffixed-inside-frame.html

Diff:

--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/scrollingcoordinator/scrolling-tree/fixed-inside-frame-actual.txt
@@ -32,15 +32,15 @@
             (vertical scrollbar mode 0)
             (has enabled vertical scrollbar 1))
           (visual viewport enabled 1)
-          (layout viewport at (0,120) size 465x400)
+          (layout viewport at (0,0) size 465x400)
           (min layout viewport origin (0,0))
           (max layout viewport origin (0,616))
           (behavior for fixed 0)
           (children 1
             (Fixed node
               (anchor edges: AnchorEdgeLeft AnchorEdgeTop)
-              (viewport rect at last layout at (0,120) size 465x400)
-              (layer position at last layout (10,130))
+              (viewport rect at last layout at (0,0) size 465x400)
+              (layer position at last layout (10,10))
             )
           )
         )
@@ -70,7 +70,6 @@
                   (bounds 465.00 400.00)
                   (children 1
                     (GraphicsLayer
-                      (position 0.00 -120.00)
                       (anchor 0.00 0.00)
                       (children 1
                         (GraphicsLayer
@@ -82,7 +81,7 @@
                               (drawsContent 1)
                               (children 1
                                 (GraphicsLayer
-                                  (position 10.00 130.00)
+                                  (position 10.00 10.00)
                                   (bounds 455.00 100.00)
                                   (contentsOpaque 1)
                                   (drawsContent 1)

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