Sets whether or not this editor is currently in underline state.
        
        :param      state | <bool>

def setFontUnderline(self, state):
        """
        Sets whether or not this editor is currently in underline state.
        
        :param      state | <bool>
        """
        font = self.currentFont()
        font.setUnderline(state)
        self.setCurrentFont(font)