[Webkit-unassigned] [Bug 6149] New: REGRESSION (WebCore-417.5): horizontal scrollbar in overflow with top border doesn't receive mouse events

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=6149

           Summary: REGRESSION (WebCore-417.5): horizontal scrollbar in
                    overflow with top border doesn't receive mouse events
           Product: WebKit
           Version: 412+
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Keywords: Regression
          Severity: normal
          Priority: P1
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: opendarwin.org at mitzpettel.com


Summary: hit-testing for the horizontal scroll bar of an overflow is off by by the width of the top border.

To reproduce: open the testcase. The horizontal scrollbar doesn't respond to clicking and dragging. 
Clicking inside the blue rect just below the scrollbar gives this error in the console (if running a debug 
build): ERROR: KHTML says we hit a RenderWidget, but AppKit doesn't agree we hit 
the corresponding NSView.

I have a patch, but like with bug 5829, I don't know how to make an automated test.

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