message: wip(svg): add explain comment
diff: @@ -120,6 +120,8 @@ export default class PatternManager extends Definable {
  updateDom(pattern: PatternObject, patternDom: SVGElement) {
  if (isSVGPattern(pattern)) {
  // New SVGPattern will not been supported in the legacy SVG renderer.
  + // svg-legacy will been removed soon.
  +
  // const svgElement = pattern.svgElement;
  // const isStringSVG = typeof svgElement === 'string';
  // if (isStringSVG || svgElement.parentNode !== patternDom) {
  