Pointing (an arrow) to a tabular node in beamer is buggy (ignorenonframetext)

Question

Maybe a bug in beamer, works OK while using the minimal document class.

Again, following the example over there, and also after playing with Circling/framing and referring to a bunch of nodes, the following doesn't work as expected:

\documentclass[ignorenonframetext,xcolor={table,svgnames}]{beamer}
%\documentclass{minimal}

\usepackage{tikz}
\usetikzlibrary{shapes,backgrounds,fit,positioning}

\begin{document}

\tikzstyle{every picture}+=[remember picture]


\begin{frame}

  \tikzstyle{na} = [baseline=-.5ex]

  \begin{tabular}{ll}
    Blah & $=$ Again blah 
    \tikz[na] \node[coordinate] (blah) {};\\ 
    Foo & $+$ Bar \\
    Buggy & $=$
    \tikz[baseline]{
      \node[rounded corners,fill=red!15,anchor=base] (bug)
      {Bug};
    }
  \end{tabular}

  \bigskip

 This is also buggy, booh \tikz[na] \node[coordinate] (booh) {};

  \begin{tikzpicture}[overlay]
    \path[very thick,->] (blah) edge [bend right] (bug);
    \path[very thick,->] (booh) edge [bend left] (bug);
  \end{tikzpicture}  

\end{frame}

\end{document}

I just found the culprit, it is the ignorenonframetext option!! But why is it so?

Answer 1

The problem is that \tikzstyle{every picture}+=[remember picture] is outside the frame and inside the body of the document, so ignorenonframetext just ignores the remember picture part. You can send this to the preamble (to make it global) or inside the frame environment (notice that I used \tikzset instead of the obsolete \tikzstyle):

\documentclass[ignorenonframetext,xcolor={table,svgnames}]{beamer}
\usepackage{tikz}
\usetikzlibrary{shapes,backgrounds,fit,positioning}

\tikzset{every picture/.style={remember picture}}

\begin{document}

\begin{frame}
  \tikzset{na/.style={baseline=-.5ex}}

  \begin{tabular}{ll}
    Blah & $=$ Again blah 
    \tikz[na] \node[coordinate] (blah) {};\\ 
    Foo & $+$ Bar \\
    Buggy & $=$
    \tikz[baseline]{
      \node[rounded corners,fill=red!15,anchor=base] (bug)
      {Bug};
    }
  \end{tabular}

  \bigskip

 This is also buggy, booh \tikz[na] \node[coordinate] (booh) {};

  \begin{tikzpicture}[overlay]
    \path[very thick,->] (blah) edge [bend right] (bug);
    \path[very thick,->] (booh) edge [bend left] (bug);
  \end{tikzpicture}  

\end{frame}

\end{document}