[Webkit-unassigned] [Bug 62746] New: Crash possible when switching scrollbar appearance preference on Mac

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=62746

           Summary: Crash possible when switching scrollbar appearance
                    preference on Mac
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


A crash is *still* possible when switching the scrollbar appearance on Mac because the current mechanism that is intended to flag ScrollAnimators as being in the page cache or not does not work correctly. Long-term the fix for this is to move the ScrollabelArea HashSet to a more appropriate place -- it's on Page right now, but instead it should be on another class that represents a single web page. Something like the top-level Document. In the meantime, I have a patch that fixes the crash.

<rdar://problem/9323983>

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