title: How to easily investigate 'This application is modifying the autolayout engine from a background thread'
body: <p>I have this message in the debugger window:</p>
  
  <blockquote>
    <p>This application is modifying the autolayout engine from a background
    thread after the engine was accessed from the main thread. This can
    lead to engine corruption and weird crashes.</p>
  </blockquote>
  
  <p>I know what it means and I know how to fix it, but the problem is that I have a lot of threads fired in different parts of the application and is difficult to get a full stack trace.<br>
  The app is not crashing, as it is treated as a warning.</p>
  
  <p>How can I pause/halt the application when this occurs, so I can see exactly what is going on there?</p>