Return plugin font option.

        All plugins in Spyder use a global font. This is a convenience method
        in case some plugins will have a delta size based on the default size.

def get_plugin_font(self, rich_text=False):
        """
        Return plugin font option.

        All plugins in Spyder use a global font. This is a convenience method
        in case some plugins will have a delta size based on the default size.
        """

        if rich_text:
            option = 'rich_font'
            font_size_delta = self.RICH_FONT_SIZE_DELTA
        else:
            option = 'font'
            font_size_delta = self.FONT_SIZE_DELTA

        return get_font(option=option, font_size_delta=font_size_delta)