title: (Qt) How to check if a QTextEdit widget text was changed from a QTabWidget
body: <p>I have a <strong>QTabWidget</strong> parented by a <strong>QMainWindow</strong> that manages <strong>QTextEdit</strong> widgets.</p>
  
  <p>I'd like to know when content was changed in one the tabs and to know which one.
  I've been trying to google a solution but after many changed lines in my code and architecture changes of my class.</p>
  
  <p>My last try was:</p>
  
  <pre><code>QTextEdit* curr_text_edit = /*slots were used to get this pointer*/;
  connect(curr_text_edit, SIGNAL(textChanged()), this, SLOT(marquerChangement()));
  </code></pre>
  
  <p>but the slot "marquerChangement()" is never called. Any ideas?</p>