[Webkit-unassigned] [Bug 118999] New: StickyPositionConstraints should store the constrainingRectAtLastLayout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118999

           Summary: StickyPositionConstraints should store the
                    constrainingRectAtLastLayout
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


Much like how FixedPositionConstraints store a viewportRectAtLastLayout, StickyConstraints should store a constrainingRectAtLastLayout. We'll need this to get sticky right in overflow areas once overflow areas scroll on the scrolling thread. 

<rdar://problem/12469203>

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