Toggles document white spaces display.

        :return: Method success.
        :rtype: bool

def toggle_white_spaces(self):
        """
        Toggles document white spaces display.

        :return: Method success.
        :rtype: bool
        """

        text_option = self.get_default_text_option()
        if text_option.flags().__int__():
            text_option = QTextOption()
            text_option.setTabStop(self.tabStopWidth())
        else:
            text_option.setFlags(
                text_option.flags() | QTextOption.ShowTabsAndSpaces | QTextOption.ShowLineAndParagraphSeparators)
        self.set_default_text_option(text_option)
        return True