message: support xlink:href in vdom
diff: @@ -192,8 +192,14 @@ function updateProps(element: Element, props: {}) {
  }
  } else if ((name.startsWith('on') || name==='value') && element[name] !== value) {
  element[name] = value;
  + } else if (name.startsWith('xlink')) {
  + const xname = name.replace('xlink', '').toLowerCase();
  + if (value == null || value === false) {
  + element.removeAttributeNS('http://www.w3.org/1999/xlink', xname);
  + } else {
  + element.setAttributeNS('http://www.w3.org/1999/xlink', xname, value);
  }
  - else {
  + } else {
  if (element.getAttribute(name) !== value) {
  if (value) element.setAttribute(name, value);
  else element.removeAttribute(name);
  