title: Code folding for condtional derivatives(#ifdefine) in Qt creator
body: <p>Is there a way to enable folding-marker for a code block surrounded by "conditional derivative" in Qt-Creator? I checked an <a href="https://stackoverflow.com/questions/11295361/code-folding-pragma-region-in-qt-creator">old link</a>, where it says it's not possible but it was back in 2012. My Qt Creator version is 3.6.1 and an example code is given below.</p>
  
  <pre><code>#define DEBUG
  
  #ifdef DEBUG
      // Print some statements.
  #endif
  </code></pre>
  
  <p>Thank you in advance.</p>