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Error de "secuencia de control no definida" para un símbolo en `\setbox` al restablecer el título del proyector

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Error de "secuencia de control no definida" para un símbolo en `\setbox` al restablecer el título del proyector

En mi presentación de proyector quería tener infolinesla línea de pie de página del tema exterior y treela línea de encabezado del tema exterior, pero mostrando el subtítulo en lugar del título en la primera línea. Así que lo tomé infolinescomo tema externo y \setbeamertemplate[headline]lo copié beamerouterthemetree.sty. Funciona y compila pero no me gusta esto me da el siguiente error:

ERROR: Undefined control sequence.

--- TeX said ---
\beamer@@tmpl@headline .../foot} \setbox \tempbox 
                                                  =\hbox {\insertsectionhead...
l.108 \begin{document}

--- HELP ---
TeX encountered an unknown command name. You probably misspelled the
name. If this message occurs when a LaTeX command is being processed,
the command is probably in the wrong place---for example, the error
can be produced by an \item command that's not inside a list-making
environment. The error can also be caused by a missing \documentclass
command.

Aquí está mi código (eliminado/purificado):

\documentclass{beamer}

\usepackage{ragged2e}
\usepackage{etoolbox}
\usepackage{pgf,tikz}
\usetikzlibrary{arrows,shapes}
\apptocmd{\enumerate}{\justifying}{}{}
\apptocmd{\itemize}{\justifying}{}{}
\addtobeamertemplate{block begin}{}{\justifying}

\usetheme{default}
\usecolortheme{beaver}
\useoutertheme{infolines}
\useinnertheme{default}
\setbeamertemplate{sections/subsections in toc}[square]
\setbeamercolor{titlelike}{bg=darkred,fg=gray!15!white}
\setbeamercolor{frametitle}{fg=darkred}
\setbeamercolor{item}{fg=darkred}
\setbeamercolor{author in head/foot}{bg=darkred,fg=gray!5!white}

\setbeamertemplate{headline}
{%
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{upper separation line head}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}
      \usebeamerfont{title in head/foot}\insertshortsubtitle
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{section in head/foot}
      \usebeamerfont{section in head/foot}
      \setbox\tempbox=\hbox{\insertsectionhead}%
      \ifdim\wd\tempbox>1pt%
        \hskip2pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt%
      \fi%
      \insertsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
      \usebeamerfont{subsection in head/foot}
      \setbox\tempbox=\hbox{\insertsubsectionhead}%
      \ifdim\wd\tempbox>1pt%
        \hskip9.4pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt%
      \fi%
      \insertsubsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
    \end{beamercolorbox}
}

\title{My (short) title}
\subtitle{Yet longer and not shortable subtitle}
\institute[SIN]{Long Long Long Long Long Long Institute Name}
\author[S. Name \and S. Name]{Name \textsc{Long} \and Name \textsc{Long}}
\justifying
\begin{document}

\frame[plain]{\titlepage}

\begin{frame}
  \frametitle{Plan}
  \tableofcontents[pausesections,subsectionstyle=shaded]
\end{frame}

\end{document}

Respuesta1

Necesitas asignar una casilla, así que hazlo.

\newsavebox{\tempbox}

Si desea utilizar el registro de casilla temporal de Beamer, haga

\makeatletter
\setbeamertemplate{headline}
{%
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{upper separation line head}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}
      \usebeamerfont{title in head/foot}\insertshortsubtitle
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{section in head/foot}
      \usebeamerfont{section in head/foot}
      \sbox\beamer@tempbox{\insertsectionhead}%
      \ifdim\wd\beamer@tempbox>1pt
        \hskip2pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt
      \fi
      \insertsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
      \usebeamerfont{subsection in head/foot}
      \sbox\beamer@tempbox{\insertsubsectionhead}%
      \ifdim\wd\beamer@tempbox>1pt
        \hskip9.4pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt
      \fi
      \insertsubsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
    \end{beamercolorbox}
}
\makeatother

Tenga en cuenta que arreglé el código usando

\sbox\beamer@tempbox{\insertsectionhead}%

cuál es el comando correcto, porque es "consciente del color" y \setbox\beamer@tempbox=\hbox{\insertsectionhead}no lo es.

Entonces, sea cual sea el método que elijas, utiliza \sbox.

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