If the gconf var use_palette_font_and_background_color be changed, this method
        will be called and will change the font color and the background color to the color
        defined in the palette.

def palette_font_and_background_color_toggled(self, settings, key, user_data):
        """If the gconf var use_palette_font_and_background_color be changed, this method
        will be called and will change the font color and the background color to the color
        defined in the palette.
        """
        self.settings.styleFont.triggerOnChangedValue(self.settings.styleFont, 'palette')