%D \module
%D   [       file=m-maybe,
%D        version=2018.07.26,
%D          title=\CONTEXT\ Extra Modules,
%D       subtitle=Maybe some day,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

%D The code here is not in the core and might never be as it's probably not
%D of much use and|/|or can interfere.

\unprotect

% \showframe
% \starttext
%     \tweakpagegoal[-\lineheight]
%     \dorecurse{40}{\inleftmargin{!}\input ward\par}
% \stoptext

\def\page_scale_text_box_indeed#1%
  {\scratchheight\ht#1\relax
   \scratchwidth \wd#1\relax
   \setbox#1\vpack\bgroup
     \hpack\bgroup
       \scale
        [\c!height=\dimexpr\textheight-\d_page_adapts_delta\relax,
         \c!width=\scratchwidth]
        {\box#1}%
     \egroup
   \egroup
   \global\d_page_adapts_delta\zeropoint
   \glet\page_scale_text_box\gobbleoneargument
   \ht#1\scratchheight
   \wd#1\scratchwidth}

\unexpanded\def\tweakpagegoal[#1]%
  {\ifx\currentoutputroutine\s!singlecolumn
     \global\d_page_adapts_delta\dimexpr#1\relax
     \ifdim\d_page_adapts_delta=\zeropoint
       \glet\page_scale_text_box\gobbleoneargument
     \else
       \glet\page_scale_text_box\page_scale_text_box_indeed
     \fi
   \else
     \global\d_page_adapts_delta\zeropoint
     \glet\page_scale_text_box\gobbleoneargument
   \fi
   \page_otr_command_set_vsize}

\protect

\endinput