As mentioned in
#333, the fix made in r2413 breaks the 'clipped' setting such that clipping can not be disabled at the StateImagery level.
The best example of this is when dragging segments of the header for MultiColumnList; the dragged imagery is always clipped to it's original segment area, whereas it should not be clipped at all.
Additional information: The issue is because clipping is now done at the GeometryBuffer level, which has no provision for disabling clipping for parts of the rendered geometry.
While the specific segment dragging can (and probably should) be fixed by other means, it still leaves us with this broken option ;)