fix #394 transition gaps

src/transition.js

@@ -126,7 +126,11 @@ function applyTransitionClass (el, stage, changeState, hasAnimation) {
 
         if (el.offsetWidth || el.offsetHeight) {
             // trigger hide transition
-            classList.add(leaveClass)
+            batcher.push({
+                execute: function () {
+                    classList.add(leaveClass)
+                }
+            })
             onEnd = function (e) {
                 if (e.target === el) {
                     el.removeEventListener(endEvent, onEnd)

test/unit/specs/transition.js

@@ -176,8 +176,11 @@ describe('Transition', function () {
                 assert.ok(typeof el.vue_trans_cb === 'function')
             })
 
-            it('should add the class', function () {
-                assert.ok(el.classList.contains(leaveClass))
+            it('should add the class', function (done) {
+                nextTick(function () {
+                    assert.ok(el.classList.contains(leaveClass))
+                    done()
+                })
             })
 
             it('should call changeState on transitionend', function () {