Document Classes ⇒ Beamer: Failure on \foreignlanguage within section titles

[pebo]

In a beamer document (using beamer-3.07), I get an "Undefined control sequence" error on a line like:

\section{Motivation \foreignlanguage{italian}{Motivazione}}

while the foreignlanguage statements works correctly elsewhere.
For an example, take the conference-ornate-20min.de template from the beamer package and declare some text within a section title as italian. I attached the modified templates both in lyx (1.5.6) and by regular editor on .tex file, compiled by pdflatex (the modified line is one containing "Motivation")
I usually work with lyx, so I don't know that much about latex and I'm not sure if this is a bug or if I'm doing anything wrong.
Could anybody provide a workaround for this problem?
Thanks in advance

[Stefan Kottwitz]

Hi Pebo,

welcome to the board!
The command \foreignlanguage will cause problems with pdf bookmarks. In such cases you can use \texorpdfstring:

Code: Select all

\section{Motivation \texorpdfstring{\foreignlanguage{italian}{motivazione}}{motivazione}}

\texorpdfstring is explained by the hyperref manual.

Stefan

[pebo]

Thank you, Stefan, like this the pdf compiles.
However, it's a little complicated to write, not as content-oriented as it should be. (I lost all this morning trying to figure out, what's wrong )
Maybe, one of hyperref, beamer or at least lyx, should handle this automatically (?)
For the moment, I will prepend this redefinition, I'll see whether it introduces new problems:

Code: Select all

\let\oldforeignlanguage\foreignlanguage
\renewcommand{\foreignlanguage}[2]{\texorpdfstring{\oldforeignlanguage{#1}{#2}}{#2}}