[Webkit-unassigned] [Bug 60741] New: Incorrect RenderLayer transforms on overflow RTL pages

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=60741

           Summary: Incorrect RenderLayer transforms on overflow RTL pages
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: enne at google.com
                CC: simon.fraser at apple.com, xji at chromium.org,
                    jamesr at chromium.org, vangelis at chromium.org,
                    nduca at chromium.org


On pages with dir=rtl, compositing, and a horizontal scrollbar, composited layers get incorrect transforms and bounds.  Without any horizontal overflow, the composited case appears identical to the software case.

At the very least, http://trac.webkit.org/browser/trunk/Source/WebCore/rendering/RenderLayerCompositor.cpp#L444 assumes that the content origin is at 0, so when boundingBoxRect.x() is negative, that calculation ends up with a very large bound.

I will attach some test cases to demonstrate this issue by resizing the window.  Compare the composited cases (with and without a horizontal scrollbar) to the software cases.

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