Comment #4 on issue 995 by tu...@tudorgirba.com: Roassal does not export the full PNG http://code.google.com/p/moose-technology/issues/detail?id=995
I looked some more. The SVGExporter relies on the assumption that the top left of the encompassing rectangle is more than 0@0. However, this does not have to be the case. So, instead of using bottomRight, we should use extent.