title: Qt problem: No QProgressBar animation with minimum and maximum steps set to 0
body: <p>I have got a problem with my QProgressBar and I hope someone got an idea...</p>
  
  <p>I have created a progress dialog with a QProgressBar on my own. I set minimum and maximum steps to 0 so that the progress indicates my program is busy (the animation thing...).</p>
  
  <p>I show() this progress dialog and activated the Qt::WindowModal for this dialog.</p>
  
  <p>The problem: I use this dialog while copying files but the progress bar stops and no animation anymore to indicate my program is still busy. I use the windows function 'SHFileOperation' to copy one directory with a lot of file to a destination. This, of course, produces a lot of load on the system but at least the progress should continue moving.</p>
  
  <p>Any help is appreciated!</p>
  
  <p>Thanks in advance,
  BearHead</p>