[Webkit-unassigned] [Bug 121041] New: Prevent overflow of width/height of layout overflow rectangle which can cause scroll bar to misfunction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=121041

           Summary: Prevent overflow of width/height of layout overflow
                    rectangle which can cause scroll bar to misfunction
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: hyatt at apple.com, bdakin at apple.com,
                    simon.fraser at apple.com, dino at apple.com


Merge https://chromium.googlesource.com/chromium/blink/+/d050f9be579d02e40c8924b4153376bc32ffba1a

When a child element is positioned very far away the width/height of layout overflow rectangle may overflow. The patch detects such cases in RenderOverflow::addLayoutOverflow and shift the top/left edges of the rectangle to avoid overflow.

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