title: PyQt Label not changing text
body: <p>I have this code running on a PyQt window on windows:</p>
  
  <pre><code>    try:
          self.actorUser.findIdfFiles(pathToFolder)
          msg = "Processando arquivos..."
          self.processingLabel.setText(msg)
  
          self.actorUser.runSimulation(pathToFolder, pathToEpw)
  </code></pre>
  
  <p>Inside the "runSimulation" code I start a subprocess using the method "call". This blocks my GUI and at the title of the window appears "Python stopping responding", but if I wait a little bit the subprocess finishes normally, and the label is finally changed. But what I want is that the label have is text really changed before the subprocess started. What can I do??</p>