Does anyone knows a hint to get the stacked boxes to the correct size?
When usinig non-zero values for the options
spaceinbetween and/or columndistance
the cells of the xtable will not properly size when spanning over rows
and/or columns.

e.g.

\starttext

\startxtable[spaceinbetween=2mm, columndistance=2mm, corner=round]
  \startxtablebody
    \startxrow
      \startxcell[ny=3] a1    \stopxcell
      \startxcell[nx=2] a2/3  \stopxcell
      \startxcell[ny=3] a4    \stopxcell
    \stopxrow
    \startxrow
      \startxcell b2 \stopxcell
      \startxcell b3 \stopxcell
    \stopxrow
    \startxrow
      \startxcell c2 \stopxcell
      \startxcell c3 \stopxcell
    \stopxrow
    \startxrow
  \startxcell[nx=3] d1/2/3  \stopxcell
      \startxcell   d4      \stopxcell
    \stopxrow
    \startxrow
      \startxcell e1 \stopxcell
      \startxcell e2 \stopxcell
      \startxcell e3 \stopxcell
      \startxcell e4 \stopxcell
    \stopxrow
  \stopxtablebody
\stopxtable

\stoptext