\begin{frame}{Merging Branches in SVN}
  The support is incomplete and fragile:
  \begin{itemize}
  \item renamed files are not merged correctly
  \item old clients will not update the merge info
  \end{itemize}

  \pause

  From the SVN Book:
  \begin{center}
  \begin{tikzpicture}
    \node[draw=structure, fill=structure!20!white, text justified,
      text width=0.95\textwidth, font=\small] {The bottom line is that
      Subversion's merge-tracking feature has an \alert{extremely
        complex} internal implementation, and the
      \texttt{svn:mergeinfo} property is the only window the user has
      into the machinery. Because the feature is \alert{relatively
        new}, a numbers of edge cases and possible unexpected
      behaviors may pop up. \hfill\itshape ---Version Control with
      Subversion};
  \end{tikzpicture}

  (Mercurial has robust built-in support for merging branches.)
  \end{center}
\end{frame}