TikZ Drawing not Fully Showing

Question

I'm not sure what this problem is called so it's hard to search for information... When I use the tikz package sometimes part of the drawing does not show fully. Currently the code I am using for a curly brace is not showing its right side... Why?

The original code from where I took it had a picture that seemed to display correctly. This is not the first time that this has happened on my Textmate.

Here is a minimal working code that uses the template I am using and only shows the graph with problematic curling braces: http://pastebin.com/g4j7kKAF

\documentclass{standalone}
\usepackage{tikz}
    \usetikzlibrary{matrix}
    \usetikzlibrary{decorations.pathreplacing}    
        \tikzstyle{underbrace style}=[decorate,decoration={brace,raise=10mm,amplitude=5pt,mirror},color=black]    

\usepackage[brazilian]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\begin{document}

      \begin{tikzpicture}[%
        >=stealth,
        shorten >=2pt,
        thick
      ]
        \matrix (block) [%
          matrix of nodes,
          nodes={%
            draw,
            anchor=center,
            minimum width=2em,
            minimum height=1em
          }
        ] {%
          1 & 2 & \node[fill=gray!99]{8}; & \node[fill=gray!50]{3}; & 4 & 6 & 9\\
        };
%\node[fill=gray!50]{1};
        \path[->] (block-1-4.north) edge [bend right=30] (block-1-3.north)
                  (block-1-3.south) edge [bend right=30] (block-1-4.south);
        \draw (block-1-1.west) node[left=0.005cm,scale=0.9] {A:};                              
        \draw (block-1-2.south) node[below=0.1cm] {$\longleftarrow$};                  
        \draw (block-1-2.south) node[left=0.2cm,below=0.4cm,scale=0.6] {Ordenado};                          
        \draw (block-1-1.north) node[above=0.1cm,scale=0.7] {0};
        \draw (block-1-2.north) node[above=0.1cm,scale=0.7] {1};
        \draw (block-1-3.north) node[above=0.1cm,scale=0.7] {i=2};
        \draw (block-1-4.north) node[above=0.05cm,scale=0.7] {j=3};
        \draw (block-1-5.north) node[above=0.1cm,scale=0.7] {4};
        \draw (block-1-6.north) node[above=0.1cm,scale=0.7] {5};
        \draw (block-1-7.north) node[above=0.1cm,scale=0.7] {6};           
        \draw (block-1-2.south east) node[right=0.25cm,below=1.9cm] {$\longrightarrow$};            
        \draw [thin] (block-1-2.south east) +(0,-2) -- +(0,+2);        
        \draw (block-1-2.south east) node[right=0.25cm,below=2.1cm] {Fronteira};    
        \draw [underbrace style] (block-1-1.south west) -- (block-1-2.south east) node [left=0.8cm,below=1.05cm] {$A_{esquerdo}$};                   
        \draw [underbrace style] (block-1-2.south east) -- (block-1-7.south east) node [left=1.8cm,below=1.05cm] {$A_{direito}$};                           

      \end{tikzpicture}
\end{document}

Answer 1

The problem is due to shorten >=2pt option. It makes all paths 2pt shorter, so decorated paths are also shorter than expected. Apply shorten >=0pt option to underbrace style paths and they will be long enough.

I've made some corrections to your code.

1. It's better to use tikzset instead to tikzstyle: Should \tikzset or \tikzstyle be used to define TikZ styles?
2. Don't use \node inside a matrix of nodes. You can change node options with syntax |[options]|.

You corrected code is:

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix}
\usetikzlibrary{decorations.pathreplacing}    
\tikzset{underbrace style/.style = 
{decorate, 
 decoration={brace, raise=10mm, amplitude=5pt, mirror},
 shorten >=0pt, color=black}}
\usepackage[brazilian]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\begin{document}
\begin{tikzpicture}[%
        >=stealth,
        shorten >=2pt,
        thick
      ]
\matrix (block) [%
      matrix of nodes,
      nodes={%
            draw,
            anchor=center,
            minimum width=2em,
            minimum height=1em
      }
      ] 
{%
  1 & 2 & |[fill=gray!99]| 8 & |[fill=gray!50]| 3 & 4 & 6 & 9\\
};

\path[->] (block-1-4.north) edge [bend right=30] 
           (block-1-3.north)
          (block-1-3.south) edge [bend right=30] 
          (block-1-4.south);
\draw (block-1-1.west) node[left=0.005cm,scale=0.9] {A:};                              
\draw (block-1-2.south) node[below=0.1cm] {$\longleftarrow$};                  
\draw (block-1-2.south) node[left=0.2cm,below=0.4cm,scale=0.6] {Ordenado};                          
\draw (block-1-1.north) node[above=0.1cm,scale=0.7] {0};
\draw (block-1-2.north) node[above=0.1cm,scale=0.7] {1};
\draw (block-1-3.north) node[above=0.1cm,scale=0.7] {i=2};
\draw (block-1-4.north) node[above=0.05cm,scale=0.7] {j=3};
\draw (block-1-5.north) node[above=0.1cm,scale=0.7] {4};
\draw (block-1-6.north) node[above=0.1cm,scale=0.7] {5};
\draw (block-1-7.north) node[above=0.1cm,scale=0.7] {6};           
\draw (block-1-2.south east) node[right=0.25cm,below=1.9cm] {$\longrightarrow$};            
\draw [thin] (block-1-2.south east) +(0,-2) -- +(0,+2);        
\draw (block-1-2.south east) node[right=0.25cm,below=2.1cm] {Fronteira};    
\draw [underbrace style] (block-1-1.south west) -- (block-1-2.south east) node [left=0.8cm,below=1.05cm] {$A_{esquerdo}$};                   
\draw [underbrace style] (block-1-2.south east) -- (block-1-7.south east) node [left=1.8cm,below=1.05cm] {$A_{direito}$};                      
\end{tikzpicture}
\end{document}