[Bug] image rendered double

[Emanuel Carnevale]

Hi why,
I got this today:

Shoes.app :width => 600, :height => 600, :resizable => false do
  image :width => 600, :height => 500 do
    nostroke
    fill "#127"
    oval :top => 400, :left => 0, :width => 600, :height => 50
  end
end

yields me two ovals...

and this one

Shoes.app :width => 600, :height => 600, :resizable => false do

    nostroke
    fill "#127"
    oval :top => 400, :left => 0, :width => 600, :height => 50

end

doesn't.

I discovered it today (at work) with windows r811, but before writing
about it I just tested (and replicated) at home on Mac with git's
latest commit.

hope this helps,
Emanuel