message: fix(transition): transition-group should only listen for first-level children's end events
diff: @@ -116,6 +116,9 @@ export default {
  addTransitionClass(el, moveClass)
  s.transform = s.WebkitTransform = s.transitionDuration = ''
  el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
  + if (e && e.target !== el) {
  + return
  + }
  if (!e || /transform$/.test(e.propertyName)) {
  el.removeEventListener(transitionEndEvent, cb)
  el._moveCb = null
  