docs: public synchronized void addAll(Collection<Layer> layers, boolean redraw) {
          checkIsNull(layers);
          for (Layer layer : layers) {
              layer.setDisplayModel(this.displayModel);
          }
          this.layersList.addAll(layers);
          for (Layer layer : layers) {
              layer.assign(this.redrawer);
          }
          if (redraw) {
              this.redrawer.redrawLayers();
          }
      }