Sets the current alignment for the editor.

def assignAlignment(self, action):
        """
        Sets the current alignment for the editor.
        """
        if self._actions['align_left'] == action:
            self.setAlignment(Qt.AlignLeft)
        elif self._actions['align_right'] == action:
            self.setAlignment(Qt.AlignRight)
        elif self._actions['align_center'] == action:
            self.setAlignment(Qt.AlignHCenter)
        else:
            self.setAlignment(Qt.AlignJustify)