[Webkit-unassigned] [Bug 67217] New: Mitigate scrollbar differences when running pixel tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67217

           Summary: Mitigate scrollbar differences when running pixel
                    tests
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: hyatt at apple.com, mitz at webkit.org, sam at webkit.org


We need to find a way to avoid having scrollbar differences between OSes from prevent us from sharing pixel results between Mac OS versions. Possible solutions (not mutually exclusive):

1. Exclude the scrollbar area from the the part of the pixel result that gets checksummed
2. Make a scrollbar theme used by DRT that draws dummy scrollbars which look the same across OSes
3. Dump scrollbar thumb position and size in render tree output so that scrollbar bugs can be tested without having to look at pixels.

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