overflow:auto with direction:rtl

This is a test case for http://bugzilla.opendarwin.org/show_bug.cgi?id=5826 Blocks with direction:rtl and overflow:auto or scroll have incorrect scrollbars.

The right column should be a mirror-image of the left column in terms of

the presence of a scrollbar
the initial position of the scroll thumb
which letters are visible initially and when you scroll (in the top 3 rows)
the position of the blue and olive boxes, initially and when you scroll (in the bottom 2 rows)

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