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This is a regression from 3.2.1, and should be marked as such. Note, resizing the window, or unfocusing then refocusing the window (such as by application switching) causes it to paint correctly.
regressed between r40663 (good) and r40738 (bad)
Created an attachment (id=27706) [details]
reduction, as best as I can get it
<div style="height: 100px; overflow-y: scroll;"><div style="height: 120px;"></div></div>
Created an attachment (id=28430) [details]
Correct the vertical scrollbar rect calculation in RenderLayer::invalidateScrollbarRect()
Fixed in <http://trac.webkit.org/projects/webkit/changeset/41546>.