Limitation of mixedcolumns?

Limitation of mixedcolumns?

[Zhichu Chen]

The "nested mixedcolumns" does not work properly when it reaches the
bottom of the "outer mixedcolumns" here:
$ context --version

mtx-context     | ConTeXt Process Management 0.60
mtx-context     |
mtx-context     | main context file:
d:/ConTeXt/tex/texmf-local/tex/context/base/context.mkiv
mtx-context     | current version: 2012.07.24 15:58

here is the minimal example (mostly copied from page-mix.mkiv
===========================================
\setupbodyfont[5pt]


\starttext

\setupmixedcolumns
  [boxedcolumns]
  [n=2,
   balance=no]

\definemixedcolumns
  [nestedboxedcolumns]
  [boxedcolumns]
  [n=2,
   background=color,
   backgroundcolor=yellow,
   color=red,
   strut=yes,
   balance=yes,
   backgroundoffset=0mm]

\startboxedcolumns
%    \dorecurse{10}{\input zapf \par \input ward \par} \obeydepth
    \startnestedboxedcolumns
        \dorecurse{15}{\input zapf\par}
    \stopnestedboxedcolumns
    \par \input zapf \par \obeydepth
    \startnestedboxedcolumns
        \input zapf
    \stopnestedboxedcolumns
    \par \input zapf
\stopboxedcolumns

\stoptext

-- 
Best Regards
Chen
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