[Webkit-unassigned] [Bug 123958] New: Scroll size is not recalculated when absolute left of child is updated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123958

           Summary: Scroll size is not recalculated when absolute left of
                    child is updated
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://artur.virtuallypreinstalled.com/webkit-scrollba
                    rs.html
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: artur at vaadin.com


Created an attachment (id=216261)
 --> (https://bugs.webkit.org/attachment.cgi?id=216261&action=review)
Test to reproduce the problem in 4 steps 

When a div with overflow: auto contains a child with position:absolute, the scroll bars are not always removed when they should be. If the overflow div shows scrollbars (for any reason) and the absolute div is moved (at least partly) outside the parent, the scrollbars will not be removed when the reason for scrollbars is removed and the absolute div is moved back to inside its parent.

Test case at http://artur.virtuallypreinstalled.com/webkit-scrollbars.html and as attachment.

Similar to #21462 and #71541 in the sense that scrollbars remain when they should not and in the sense that hacks to get around this become ugly and inefficient.

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