[NTG-context] tabulation and \textwidth

[Pablo Rodriguez]

Dear list,

I have this sample:

  \showframe
  \startsetups[footers]
  \starttabulate
    [|cw(.5\textwidth)|
     cw(.5\textwidth)|]
    [unit=0pt]
  \NC one\NC two\NC\NR
  \stoptabulate
  \stopsetups

  \setupfootertexts[\directsetup{footers}]
  \starttext
  \dorecurse{20}{\input{zapf.tex}\par}
  \startitemize[columns, two]
  \dorecurse{20}
    {\startitem\input{zapf.tex}\stopitem}
  \stopitemize
  \startitemize[columns, three]
  \dorecurse{15}
    {\startitem\input{zapf.tex}\stopitem}
  \stopitemize
  \startitemize[columns, four]
  \dorecurse{10}
    {\startitem\input{zapf.tex}\stopitem}
  \stopitemize
  \stoptext

How can I avoid that tabulation alters the \textwidth so that it remains
constant and item columns doesn’t afect it?

Many thanks for your help,

Pablo
--
http://www.ousia.tk