title: QtCreator continuously saves .pro.user file inside a project
body: <p>I'm experiencing an annoying behavior of <code>QtCreator</code>: when a project is open, <code>QtCreator</code> keeps saving the project's <code>.pro.user</code> file over and over, about every 10 seconds. Given that my projects are under the <code>Dropbox</code> folder, I see the <code>Dropbox</code> icon spinning forever. I don't remember having seen this behavior before, anybody has hints about this?</p>
  
  <p>This is my version of <code>QtCreator</code>:</p>
  
  <pre><code>Qt Creator 2.5.2
  Based on Qt 4.8.2 (64 bit)
  Built on Sep 22 2012 at 14:57:50
  </code></pre>
  
  <p>It's not a <code>Dropbox</code> sync issue, because if I stop my other PC's instance, the problem persists.</p>