Default v-transition class is not being removed after transition is updated

[sqal]

Vue.js version

= 1.0.18 (any version i think)

Reproduction Link

http://www.webpackbin.com/VyoNXXrXb

What is Expected?

If dynamically binded transition is updated, and previous transition was vue default, v-transition class should be removed.

What is actually happening?

Check the example. If we change transition from default, v-transition class is not being removed. But when we have some custom transition on start e.g. slide and we change it to fade then slide-transition class is properly removed.

[Teddy-Zhu]

it seems the default value transition: '' causes the problem
when i set transition: 'xxxx'(xxxx is anthing) ,the v-transition had been removed normally

http://www.webpackbin.com/V1m34Dq7Z

[posva]

Let me take a look 😄