With this code mkii and mkiv make differents pdf :
mkiv doesn't show the header after the second \part.
Perhaps \getmarking is obsolete ?
\setuppagenumbering[way=bytext,partnumber=no,location={margin},alternative=doublesided]
\setupcolors[state=start]
\setupinteraction[state=start]
\setupbodyfont[ss]
\setuppapersize[A4][A4]
\setuphead[part]
[placehead=yes,
page=right]
\setuphead[chapter]
[placehead=yes,page=yes,before=,after=,]
\setuphead[section]
[placehead=yes,page=yes,before=,after=,]
\setuphead[subsection]
[placehead=yes,before=,after=,]
\def\ChapterId#1{\setupheadertexts[text]
[{}]
[{\getmarking[chapter][first]---\getmarking[section][first]}]
[{\getmarking[chapter][first]---\getmarking[section][first]}]
[{}]}
\starttext
\part{Part}
\chapter{Chapter}
\ChapterId{}
\section{Section}
foo
\chapter{Chapter}
\ChapterId{}
\section{Section}
goo
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\part{Part}
\chapter{Chapter}
\ChapterId{}
\section{Section}
foo
\chapter{Chapter}
\ChapterId{}
\section{Section}
goo
\stoptext
--
luigi
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