title: QFileSystemWatcher: failed to add paths C: (can't watch Windows drives)
body: <p>The following code raises <code>failed to add paths</code>.</p>
  
  <pre><code>auto f = new QFileSystemWatcher();
  f-&gt;addPath("C:");
  // Also tried f-&gt;addPath("C:/") and f-&gt;addPath("C:\\")
  </code></pre>
  
  <p>Adding paths like <code>C:/folder</code> works all right.</p>
  
  <p>So I can't watch the Windows drives.</p>