Revert "support transition on component with v-show in root node (fix vuejs#3431)"

This reverts commit aab560e.

Author: yyx990803

src/platforms/web/runtime/directives/show.js

@@ -3,36 +3,16 @@
 import { isIE9 } from 'web/util/index'
 import { enter, leave } from '../modules/transition'
 
-// The v-show directive may appear on a component's parent vnode or its
-// inner vnode, and the transition wrapper may be defined outside or inside
-// the component. To cater for all possible cases, recursively search for
-// possible transition defined on component parent placeholder or inside
-// child component.
-function detectTransitionNode (vnode: VNode): VNodeWithData {
-  let parent = vnode
-  while ((parent = parent.parent)) {
-    if (hasTransition(parent)) {
-      return parent
-    }
-  }
-  if (hasTransition(vnode)) {
-    return vnode
-  }
-  while (vnode.child && (vnode = vnode.child._vnode)) {
-    if (hasTransition(vnode)) {
-      return vnode
-    }
-  }
-  return vnode
-}
-
-function hasTransition (vnode) {
-  return vnode.data && vnode.data.transition
+// recursively search for possible transition defined inside the component root
+function locateNode (vnode: VNode): VNodeWithData {
+  return vnode.child && (!vnode.data || !vnode.data.transition)
+    ? locateNode(vnode.child._vnode)
+    : vnode
 }
 
 export default {
   bind (el: any, { value }: VNodeDirective, vnode: VNodeWithData) {
-    vnode = detectTransitionNode(vnode)
+    vnode = locateNode(vnode)
     const transition = vnode.data && vnode.data.transition
     if (value && transition && transition.appear && !isIE9) {
       enter(vnode)
@@ -44,7 +24,7 @@ export default {
   update (el: any, { value, oldValue }: VNodeDirective, vnode: VNodeWithData) {
     /* istanbul ignore if */
     if (value === oldValue) return
-    vnode = detectTransitionNode(vnode)
+    vnode = locateNode(vnode)
     const transition = vnode.data && vnode.data.transition
     if (transition && !isIE9) {
       if (value) {

test/unit/features/transition/transition.spec.js

@@ -558,45 +558,6 @@ if (!isIE9) {
       }).then(done)
     })
 
-    it('transition with v-show, with transition outside and v-show inside', done => {
-      const vm = new Vue({
-        template: `
-          <div>
-            <transition name="test">
-              <test :ok="ok"></test>
-            </transition>
-          </div>
-        `,
-        data: { ok: true },
-        components: {
-          test: {
-            props: ['ok'],
-            template: `<div v-show="ok" class="test">foo</div>`
-          }
-        }
-      }).$mount(el)
-
-      // should not apply transition on initial render by default
-      expect(vm.$el.textContent).toBe('foo')
-      expect(vm.$el.children[0].style.display).toBe('')
-      vm.ok = false
-      waitForUpdate(() => {
-        expect(vm.$el.children[0].className).toBe('test test-leave test-leave-active')
-      }).thenWaitFor(nextFrame).then(() => {
-        expect(vm.$el.children[0].className).toBe('test test-leave-active')
-      }).thenWaitFor(duration + 10).then(() => {
-        expect(vm.$el.children[0].style.display).toBe('none')
-        vm.ok = true
-      }).then(() => {
-        expect(vm.$el.children[0].style.display).toBe('')
-        expect(vm.$el.children[0].className).toBe('test test-enter test-enter-active')
-      }).thenWaitFor(nextFrame).then(() => {
-        expect(vm.$el.children[0].className).toBe('test test-enter-active')
-      }).thenWaitFor(duration + 10).then(() => {
-        expect(vm.$el.children[0].className).toBe('test')
-      }).then(done)
-    })
-
     it('leaveCancelled (v-show only)', done => {
       const spy = jasmine.createSpy('leaveCancelled')
       const vm = new Vue({