mp to pdf inline conversion adds whitespace (2006.09.26 beta)

[Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>]

I'm using the 2006.09.26 beta, and noticed an extra gap before some
external metapost figures.  Here is a small test:

============================ test.mp =================
beginfig(1)
  draw fullcircle scaled (0.75in) xscaled 1.5;
endfig;
end
======================================================

With this test file, there is a whitespace of about 1cm between the
first hairline and the ellipse:
=================== test.tex (has 1cm gap) ===========
\starttext
\hrule
\placefigure[force,none]{}{\externalfigure[test.1]}
\hrule
\stoptext
======================================================

If I convert test.1 to test-1.pdf and include that, all is fine:
=================== test.tex (works) =================
\starttext
\hrule
\placefigure[force,none]{}{\externalfigure[test-1.pdf]}
\hrule
\stoptext
======================================================

If test.mp draws a square or rectangle instead of an ellipse, then
there's no difference (both versions of test.tex work).

-Sanjoy

`A society of sheep must in time beget a government of wolves.'
   -- Bertrand de Jouvenal