spread(spread, min) {
    if (spread) {
      this._spread = spread === "none" ? false : true; // this.props.spread = this._spread;

      this.update({
        spread: this._spread
      });
    }

    if (min >= 0) {
      this._minSpreadWidth = min;
    }

    return this._spread;
  }
Switch between using spreads or not, and set the
width at which they switch to single.
@param  {string} spread "none" | "always" | "auto"
@param  {number} min integer in pixels
@return {boolean} spread true | false