conditionally add \vfill before section if at end of page

conditionally add \vfill before section if at end of page

[denis.maier]

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Hi,

I'm still playing/struggling with vertical glue to have pages of a constant height. The following settings give reasonable results:

=============
\setuppapersize[A5][A5]

\setupalign[line]
\setuptolerance[vertical,stretch]
\setupinterlinespace[
                stretch=0.001,
                shrink=0.001,
                ]

\showframe

\starttext

\section{Section}
\input knuth\par
\input knuth\par
\input knuth\par
\input ward
\input ward
\input ward
%\vfill % can a \vfill be added automatically here?


\section{Section}
\input knuth\par

% here we don't have a \vfill as this is on the middle of the page
\section{Section}
\input knuth\par

\stoptext
======================

However, I don't want the stretching if the next page starts with a section heading. Is there any way to add a \vfill on a page immediately before a section heading? \doifatpageborder \doifatpagestart or something similar ?

Thanks for you help,
Denis

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