Marks that the current widget has changed.

def markCurrentChanged(self):
        """
        Marks that the current widget has changed.
        """
        view = self.currentView()
        if view:
            view.setCurrent()
            self.setFocus()
            view.setFocus()
            self._hintLabel.hide()
        else:
            self._hintLabel.show()
            self._hintLabel.setText(self.hint())

        if not self.count():
            self.tabBar().clear()

        self.adjustSizeConstraint()