[BUG] beamer export

[Leo Butler]

The following Org document shows a bug in the beamer exporter.


#+TITLE:     Writing Beamer presentations in org-mode
#+AUTHOR:    Eric S Fraga
#+AUTHOR:    (bug report by Leo Butler)
#+EMAIL:     e.fr...@ucl.ac.uk
#+DATE:      2010-03-30 Tue
#+DESCRIPTION: 
#+KEYWORDS: 
#+LANGUAGE:  en
#+OPTIONS:   H:2 num:t toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
#+OPTIONS:   TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc
#+INFOJS_OPT: view:nil toc:nil ltoc:t mouse:underline buttons:0 
path:https://orgmode.org/org-info.js
#+EXPORT_SELECT_TAGS: export
#+EXPORT_EXCLUDE_TAGS: noexport
#+HTML_LINK_UP:
#+HTML_LINK_HOME:
#+LATEX_COMPILER: lualatex
#+startup: beamer
#+LaTeX_CLASS: beamer
#+LaTeX_CLASS_OPTIONS: [bigger]
#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) 
%4BEAMER_col(Col) %10BEAMER_extra(Extra)


* A Bug Report about the Beamer Tutorial

** 
#+begin_src elisp :exports both
(org-version)
#+end_src

#+RESULTS:
: 9.5.2

** The bug
The [[https://orgmode.org/worg/exporters/beamer/tutorial.html][Beamer tutorial 
by Eric Fraga]]
([[https://orgmode.org/worg/exporters/beamer/tutorial.html]]) has an
example that shows how to create a two column frame using org. The
first column is not identified, though.

** The Org code
Here is the org code.
\tiny
#+begin_src org :exports code
  ,** Two columns
  ,*** A block                                           :B_ignoreheading:BMCOL:
      :PROPERTIES:
      :BEAMER_env: ignoreheading
      :BEAMER_col: 0.4
      :END:
      - this slide consists of two columns
      - the first (left) column has no heading and consists of text
      - the second (right) column has an image and is enclosed in an
        @example@ block

  ,*** A screenshot                                            :BMCOL:B_example:
      :PROPERTIES:
      :BEAMER_col: 0.6
      :BEAMER_env: example
      :END:
      ,#+ATTR_LaTeX: :width \textwidth
      [[./a-simple-slide.png]]
#+end_src

** The \LaTeX{} code
Here is the generated \LaTeX{} code. I needed to add comment characters (%) to 
each line due to a bug in the =verbatim= environment.\pause
\tiny
#+begin_src latex :exports code
  % \begin{frame}[label={sec:orgcc0ebff}]{Two columns}
  % \begin{itemize}
  % \item this slide consists of two columns
  % \item the first (left) column has no heading and consists of text
  % \item the second (right) column has an image and is enclosed in an
  % @example@ block
  % \end{itemize}

  % \begin{column}{0.6\columnwidth}
  % \begin{example}[A screenshot]
  % \begin{center}
  % \includegraphics[width=\textwidth]{./a-simple-slide.png}
  % \end{center}
  % \end{example}
  % \end{column}
  % \end{columns}
  % \end{frame}
#+end_src
\pause\normalsize
The first =itemize= environment should have been wrapped by a =column= 
environment inside the =columns= environment.