title: Changing qt5 tab names dynamically
body: <p>Say I have a tabwidget in my ui file
  this is how im adding tabs right now:</p>
  
  <pre><code>QPlainTextEdit *tab = new QPlaintextEdit;
  int index = ui-&gt;tabWidget-&gt;addTab(tab, "changeme");
  </code></pre>
  
  <p>Now I'm wondering if it's possible to change the name of the tab on the go, 
  for example when subclassing QPLainTextEdit in a class and connecting a signal to it when the text changes then i'd like to add a little star to the tab to indicate that the file has been modified, is it even possible?</p>