[Webkit-unassigned] [Bug 246002] New: Fix calculation of SeenFixedContainingBlockLayer in RenderLayer::flagsForUpdateLayerPositions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246002

            Bug ID: 246002
           Summary: Fix calculation of SeenFixedContainingBlockLayer in
                    RenderLayer::flagsForUpdateLayerPositions
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: simon.fraser at apple.com

In  https://commits.webkit.org/253809@main, both RenderLayer::recursiveUpdateLayerPositions and RenderLayer::flagsForUpdateLayerPositions check RenderElement::canContainFixedPositionObjects() to decide whether to add the SeenFixedContainingBlockLayer flag, but this function always render true for RenderView. RenderLayer::recursiveUpdateLayerPositions excludes that case while RenderLayer::flagsForUpdateLayerPositions does not, they should be made consistent.

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