Conditional Column Breaks

Conditional Column Breaks

[Thangalin]

Hi,

How would you create a conditional column break that is only applied
if inserting the break does not result in a page break? For example,
in the following code the "if" statements exemplify the desired
behaviour:

\setuphead[chapter][
  before={\startcolumns[n=2, balance=no,]},
  after={\stopcolumns},
]

% If the section is the last section in the chapter
% *and* the section is not in the last column *and*
% inserting a column break does not cause pagination...
\setuphead[section][
  before={%
    \if_last_section{%
      \if_not_last_column{%
        \if_fits_in_last_column_without_pagination{\columnbreak}
      }
    }
  },
]

\starttext
  \startchapter
    \startsection[title=Section1]
    \input knuth
    \stopsection
    \startsection[title=Section2]
    \input zapf
    \stopsection
    \startsection[title=Section3]
    \input knuth
    \stopsection
  \stopchapter
\stoptext

Many kind regards.
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