[texhax] strange behaviour with \parshape, list-like environment and minipage

[asnd at triumf.ca]

> The good news is, it works with varwidth (see attached) but I have got to
> investigate what changes varwidth makes so that this works.

Varwidth has to sift through the vertical list measuring and resetting
boxes.  Offsets of boxes (\moveright or \parshape) are lost when they are
collected with \lastbox, so varwidth has to save markers for the shifts
and then apply the proper shift as kerns.

D