src/vs/editor/contrib/colorPicker/browser/colorPickerWidget.ts/SaturationBox/layout
class SaturationBox:	layout(): void {
		this.width = this.domNode.offsetWidth;
		this.height = this.domNode.offsetHeight;
		this.canvas.width = this.width * this.pixelRatio;
		this.canvas.height = this.height * this.pixelRatio;
		this.paint();

		const hsva = this.model.color.hsva;
		this.paintSelection(hsva.s, hsva.v);
	}