Two-part @Graphic vs. xsize etc

[Valery Ushakov]

I have stumbled into a problem with two-part left parameter of
@Graphic.  When the second part is emitted the values of xsize etc
might have been overwritten by nested calls to @Graphic inside the
right parameter.

Attached is a small example that demonstrates what I'm after.
@TightCurveBox symbol includes a workaround to save/restore the
values.  Calling LoutCurveBox in the "after" part is visually better
since it avoids cell background painting over the box.

I wonder if lout should re-emit a call to LoutGraphic before the
second part if it's not empty.

-uwe

graphic2.lt
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