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From: Rik Kabel via ntg-context <ntg-context@ntg.nl>
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Subject: Undefined control sequence \??markingfilter,
 with MWE to recreate
Date: Sat, 9 Oct 2021 15:53:11 -0400
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Error with 20211008 ConTeXt:

    ConTeXt  ver: 2021.10.08 20:18 LMTX fmt: 2021.10.9  int: english/english

    ...

    tex error       > tex error on line 1 in file ./mmm.tex: Undefined
    control sequence \??markingfilter



    <argument>
         \csname \??markingfilter
         \v!default \endcsname {chapter}
    <macro> \sectionheadmarkingtitle
         #1#2->\clf_markingtitle {#1}{#2
         }
    <macro> \strc_markings_get_yes
         ...rking \begincsname \??markingclass #1\endcsname {#2}{#3}}\fi
    \orelse \ifparameter #2\or \markingcommand {#1}{\csname
    \??markingfilter #2\endcsname {#1}}\else \markingcommand
    {#1}{\csname \??markingfilter \v!default \endcsname {#1}}
         \fi \endgroup ...
    <to be read again>

         \fi
    <macro> \page_layouts_process_element_indeed
         ...andcolor #1#2\begincsname \??layouttextstrut
    \layoutelementparameter \c!strut \endcsname \ignorecrlf \edef
    \p_width {\layoutelementparameter #3}\ifempty \p_width \else
    \expandafter \page_layouts_process_element_limited \fi \p_text
         \endgroup
    <macro> \currentlayoutelement
         ...kern -\makeupwidth \fi \letfromlayoutelementparameter
    \p_text \c!righttext \ifempty \p_text \kern \makeupwidth \else \hbox
    to \makeupwidth \bgroup \hss \page_layouts_process_element_indeed
    \c!rightstyle \c!rightcolor \c!rightwidth
         \egroup \fi
      ...

    <line 3.12>
         \stoptext

      1 >>
      2     %\setupheadertexts [][][{\it\getmarking[chapter]}][]  % fails
      3     \setupheadertexts [][][{\getmarking[chapter]}][]     % fails
      4     %\setupheadertexts [][][\getmarking[chapter]][]       % succeeds

    MWE to create. Note that the \it is not necessary to trigger the
    error, just the braces.

    %\setupheadertexts [][][{\it\getmarking[chapter]}][]  % fails
    \setupheadertexts [][][{\getmarking[chapter]}][]     % fails
    %\setupheadertexts [][][\getmarking[chapter]][]       % succeeds

    \starttext

    \chapter{abc}
    abc
    \chapter{def}
    def
    \stoptext

-- 
Rik

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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>Error with 20211008 ConTeXt:</p>
    <blockquote>
      <p><font face="monospace">ConTeXt  ver: 2021.10.08 20:18 LMTX 
          fmt: 2021.10.9  int: english/english</font></p>
      <p><font face="monospace">...</font></p>
      <p><font face="monospace">tex error       &gt; tex error on line 1
          in file ./mmm.tex: Undefined control sequence \??markingfilter
          <br>
          <br>
          <br>
          <br>
          &lt;argument&gt; <br>
              \csname \??markingfilter <br>
              \v!default \endcsname {chapter}<br>
          &lt;macro&gt; \sectionheadmarkingtitle <br>
              #1#2-&gt;\clf_markingtitle {#1}{#2<br>
              }<br>
          &lt;macro&gt; \strc_markings_get_yes <br>
              ...rking \begincsname \??markingclass #1\endcsname
          {#2}{#3}}\fi \orelse \ifparameter #2\or \markingcommand
          {#1}{\csname \??markingfilter #2\endcsname {#1}}\else
          \markingcommand {#1}{\csname \??markingfilter \v!default
          \endcsname {#1}}<br>
              \fi \endgroup ...<br>
          &lt;to be read again&gt; <br>
              <br>
              \fi <br>
          &lt;macro&gt; \page_layouts_process_element_indeed <br>
              ...andcolor #1#2\begincsname \??layouttextstrut
          \layoutelementparameter \c!strut \endcsname \ignorecrlf \edef
          \p_width {\layoutelementparameter #3}\ifempty \p_width \else
          \expandafter \page_layouts_process_element_limited \fi \p_text
          <br>
              \endgroup <br>
          &lt;macro&gt; \currentlayoutelement <br>
              ...kern -\makeupwidth \fi \letfromlayoutelementparameter
          \p_text \c!righttext \ifempty \p_text \kern \makeupwidth \else
          \hbox to \makeupwidth \bgroup \hss
          \page_layouts_process_element_indeed \c!rightstyle
          \c!rightcolor \c!rightwidth <br>
              \egroup \fi <br>
           ...<br>
          <br>
          &lt;line 3.12&gt; <br>
              \stoptext<br>
          <br>
           1 &gt;&gt;  <br>
           2     %\setupheadertexts [][][{\it\getmarking[chapter]}][]  %
          fails<br>
           3     \setupheadertexts [][][{\getmarking[chapter]}][]     %
          fails<br>
           4     %\setupheadertexts [][][\getmarking[chapter]][]       %
          succeeds<br>
        </font></p>
      <p>MWE to create. Note that the \it is not necessary to trigger
        the error, just the braces.<br>
      </p>
      <p><font face="monospace">%\setupheadertexts
          [][][{\it\getmarking[chapter]}][]  % fails<br>
          \setupheadertexts [][][{\getmarking[chapter]}][]     % fails<br>
          %\setupheadertexts [][][\getmarking[chapter]][]       %
          succeeds<br>
          <br>
          \starttext<br>
          <br>
          \chapter{abc}<br>
          abc<br>
          \chapter{def}<br>
          def<br>
          \stoptext</font></p>
    </blockquote>
    <p>-- <br>
      Rik<br>
    </p>
  </body>
</html>
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