title: Qt connect two signals together using QueuedConnection
body: <p>Qt <a href="http://qt-project.org/doc/qt-4.8/signalsandslots.html">documentation</a> states that it is possible to connect two signals together:</p>
  
  <blockquote>
    <p>It is even possible to connect a signal directly to another signal. </p>
  </blockquote>
  
  <p>I tried:</p>
  
  <pre><code>connect(x, SIGNAL(S()), y, SIGNAL(func()));
  </code></pre>
  
  <p>and it works as mentioned, but Qt documentation continues:</p>
  
  <blockquote>
    <p>(This will emit the second signal immediately whenever the first is emitted.)</p>
  </blockquote>
  
  <p>Does this mean that QueuedConnection will not work correctly? Can I connect two signals across threads?</p>
  
  <p>The reason I am asking this is because I solved a class of crashes on an application by avoiding this, but I am not sure if this was related to connecting signals together.</p>