Qt Code: 
  1. app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()));
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Quote Originally Posted by jacek
You don't need this in Qt4.
After removing it, it became better but still from time to time the program quits when I confirm login with enter instead of clicking the button. I will therefore rewrite the main the way you suggested first, and do app.setQuitOnLastWindowClosed( false ); before the login dialog is displayed and enable it again before the main window is shown.