setBackground (color, url) {
    // if (color == this.configObj.pref('bkgd_color') && url == this.configObj.pref('bkgd_url')) { return; }
    this.configObj.pref('bkgd_color', color)
    this.configObj.pref('bkgd_url', url, true)

    // This should be done in  this.svgCanvas.js for the borderRect fill
    this.svgCanvas.setBackground(color, url)
  }
@param {string} color
@param {string} url
@returns {void}