merge.tex

\input{common.tex}
\begin{document}
\begin{tikzpicture}[main]
    \boundingbox
    \normalcommits
    \indexnode[2,-3]
    \worknode[-2,-3]
    \commit 2eecb (2) -> B;
    \commit 33104 (3) -> 2;
    \branch other -> 3;

    % draw the old branch manually with a long line
    \node [old branch, above=1 of E] (old main) {main};
    \path [old branch line] (old main) edge (E);
    \node [cancel ref, above=.2\g of E, anchor=center] {};
    \oldHEAD -> old main;

    \newcommit f8bc5 (F) -> E;
    \branch main -> F;
    \HEAD -> main;
    \path [background line, bend right=15] (F) edge[-] (3);
    \path [commit line, bend right=15] (F) edge (3);

    \node [cmd] at (0, 3.75) {git merge other};

    \node [inner sep=8\gLine] (merge) at (0,-1) {3-way merge};

    \path [background line]
        (3) edge [-, bend right=15] (merge)
        ;
    \path [line]
        (3) edge [bend right=15] (merge)
        (B) edge [bend right=37] (merge)
        (E) edge [bend left=20] (merge)
        (merge) edge [bend right=10] (index)
        (merge) edge [bend left=10] (work)
        (index) edge [bend right=35] node [near start] {(if no conflicts)} (F)
        (old HEAD label) edge [dashed, bend left=35] (HEAD)
        ;

\end{tikzpicture}
\end{document}