title: how to change dart line length in vscode when formatting dart files?
body: <p>i'm using VS Code for flutter development and one issue i have is code formatting (styling) which is not as customizable as it is in android-studio. my problem is that each time vs code saves dart files it will break my lines very short like below:</p>
  
  <pre class="lang-dart prettyprint-override"><code>var tuple =
         settings.arguments as Tuple3&lt;String, int, Field&gt;;
  </code></pre>
  
  <p>obviously this is what i want :</p>
  
  <pre class="lang-dart prettyprint-override"><code>var tuple = settings.arguments as Tuple3&lt;String, int, Field&gt;;
  </code></pre>
  
  <p>how can i solve this problem?</p>