transition: handle just-entered edge case

Author: yyx990803

src/transition/transition.js

@@ -94,10 +94,20 @@ p.enter = function (op, cb) {
  */
 
 p.enterNextTick = function () {
+
+  // Importnatn hack:
+  // in Chrome, if a just-entered element is applied the
+  // leave class while its interpolated property still has
+  // a very small value (within one frame), Chrome will
+  // skip the leave transition entirely and not firing the
+  // transtionend event. Therefore we need to protected
+  // against such cases using a one-frame timeout.
   this.justEntered = true
-  _.nextTick(function () {
-    this.justEntered = false
-  }, this)
+  var self = this
+  setTimeout(function () {
+    self.justEntered = false
+  }, 17)
+
   var enterDone = this.enterDone
   var type = this.getCssTransitionType(this.enterClass)
   if (!this.pendingJsCb) {