Detect when the focus goes out of this widget.

        This is used to make the file switcher leave focus on the
        last selected file by the user.

def focusOutEvent(self, event):
        """
        Detect when the focus goes out of this widget.

        This is used to make the file switcher leave focus on the
        last selected file by the user.
        """
        self.clicked_outside = True
        return super(QLineEdit, self).focusOutEvent(event)