[Webkit-unassigned] [Bug 227679] New: [WPE] Fieldset elements can incorrectly get treated as opaque with async scrolling overflow areas enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227679

            Bug ID: 227679
           Summary: [WPE] Fieldset elements can incorrectly get treated as
                    opaque with async scrolling overflow areas enabled
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clord at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com
            Blocks: 224596

imported/w3c/web-platform-tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-overflow.html is failing because the 'actual' result image has a transparent area that should be opaque white (it otherwise matches the expected image). I assume this is happening because the fieldset area that overlaps this transparent area is being treated as an opaque rectangle, when its actual opaque area is determined by its children. This bug almost certainly isn't WPE-specific, but only WPE has async overflow scrolling enabled for all tests.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=224596
[Bug 224596] [WPE] Several scroll related tests are failing since r275593
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