Hi Hans,
there is a big gap between the content and the caption of each float in
a floatcombination environment.
%%%% begin example
\useMPlibrary[dum]
\starttext
\startplacefigure[title={First graphic}]
\externalfigure[one]
\stopplacefigure
\startfloatcombination
\startplacefigure[title={Second graphic}]
\externalfigure[two]
\stopplacefigure
\stopfloatcombination
\stoptext
%%%% end example
This is probably a result of the following two command from
strc-flt.mkvi where you put the caption in a \vbox with a height of 1pt
and flush it afterwards in \vtop which shifts the content down to the
baseline. As a result of this a empty space was added at the top of the
caption.
A simple fix for this is to raise the box with the caption when it is
added to the combination.
%%%% begin strc-flt.mkvi
\def\strc_floats_build_box_separate_make
{\offinterlineskip
\vpack to \onepoint{\box\b_strc_floats_content}\break
\vpack to \onepoint{\box\b_strc_floats_caption}}
\def\strc_floats_build_box_separate_split#1%
{\setbox\scratchbox\vbox{%
\setbox\scratchbox\vpack{#1}%
\unvbox\scratchbox\relax
\setbox\scratchbox\lastbox
%\doloop{%
\unvbox\scratchbox
\setbox\scratchbox\lastbox
% \ifdim\ht\scratchbox=2\onepoint
\unvbox\scratchbox
\setbox\scratchbox\lastbox
% \exitloop
% \fi}%
\splittopskip\zeropoint
\global\setbox\b_strc_floats_separate_content\vsplit\scratchbox to
\onepoint
\global\setbox\b_strc_floats_separate_caption\vsplit\scratchbox to
\onepoint
\global\setbox\b_strc_floats_separate_content\vpack{\unvbox\b_strc_floats_separate_content\setbox0\lastbox\unvbox0}%
\global\setbox\b_strc_floats_separate_caption\tpack{\unvbox\b_strc_floats_separate_caption\setbox0\lastbox\unvbox0}%
}}
%%%% end strc-flt.mkvi
Wolfgang
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