I have redefined the table of contents bullets in my slides to a circled number. However, long section titles which span more than one line do not align with the text from the previous line but with the section number. How can I fix this?

Minimal working example

\documentclass{beamer}

\usepackage{tikz}
\newcommand*\circled[1]{\tikz[baseline=(char.base)]{
\node[shape=circle,draw,inner sep=1pt] (char) {#1};}}

\setbeamertemplate{section in toc}{
\protect\usebeamercolor[fg]{enumerate item}%
\protect\circled{\inserttocsectionnumber}~\inserttocsection%
}

\begin{document}

\section{some really long title some really long title some really long title
some really long title}

\begin{frame}{Contents}
\tableofcontents[currentsection,hideallsubsections,subsubsectionstyle=hide]
\end{frame}

\end{document}

-
Hi ilprincipe. It is always preferable to post complete minimal working examples rather than code snippets because this helps people to answer you. You should also include the code needed to generate \circled{} for the sake of completeness. –  Claudio Fiandrino Aug 21 '13 at 14:24
Sorry, I thought this was sufficiently simple. Have added a MWE. –  ilprincipe Aug 21 '13 at 14:34
Thank you for providing the MWE. Perhaps, the simplest solution is to exploit \section[Short title that appears only in the toc]{Long title that appears in the frame}. I'm sure we have some answer about this, but at the moment I'm not able to find them. –  Claudio Fiandrino Aug 21 '13 at 14:48
I am already exploiting that for the header. However, the second part in curly brackets is the one appearing in the table of contents. Also, this is for a presentation of a series of papers/projects, and not all titles can be shortened sufficiently. –  ilprincipe Aug 21 '13 at 15:04
this is most probably not the answer you are searching for, but if you put \hspace{-16pt} as the first thing inside of circled[1]{ the text is aligned. –  Trylks Aug 21 '13 at 16:18

The following answer is based on

beamerbaseauxtemplates.sty

Just switched the colours a bit and the linestyle

\documentclass{beamer}

\setbeamertemplate{section in toc}{
\leavevmode\leftskip=2ex%
\llap{%
\usebeamerfont*{section number projected}%
\usebeamercolor{section number projected}%
\begin{pgfpicture}{-1ex}{0ex}{1ex}{2ex}
\color{bg}
\pgfpathcircle{\pgfpoint{0pt}{.75ex}}{1.4ex}
\pgfusepath{stroke}
\pgftext[base]{\color{bg}\inserttocsectionnumber}
\end{pgfpicture}\kern1.25ex%
}%
\inserttocsection\par
}

\begin{document}

\section{some really long title some really long title some really long title
some really long title}

\begin{frame}{Contents}
\tableofcontents[currentsection,hideallsubsections,subsubsectionstyle=hide]
\end{frame}

\end{document}


-
\documentclass{beamer}

\usepackage{tikz}
\newcommand*\circled[1]{\tikz[baseline=(char.base)]{
\node[shape=circle,draw,inner sep=1pt] (char) {#1};}}

\setbeamertemplate{section in toc}{%
\usebeamercolor[fg]{enumerate item}%
\makebox[2em][l]{\circled{\inserttocsectionnumber}}%
\parbox[t]{\dimexpr\linewidth-2em}{\inserttocsection}%
}

\begin{document}

\section{some really long title some really long title some really long title
some really long title}

\begin{frame}{Contents}
blblblbl % to show the margin
\tableofcontents[currentsection,hideallsubsections,subsubsectionstyle=hide]
\end{frame}

\end{document}

-