transition class not removed

[zcoding]

Version

2.4.2

Reproduction link

https://jsfiddle.net/guwt89go/4/

Steps to reproduce

1. 打开上面的测试链接，等页面加载好
2. 马上切到浏览器的其他标签页
3. 等至少 8 秒（等动画都执行完）再回到测试页面

What is expected?

回到测试页面时 "test" 应该显示出来

What is actually happening?

"test" 没有显示出来，点一次 toggle 还是没出来，再点一次才出来

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浏览器：Chrome 最新
操作系统：macOS

最后的状态应该是 this.show === true 没错，但是似乎 shit-leave-to 这个类没有移除？

[jkzing]

It' seems this edge case related to #6024, and tracked in #5800.

[posva]

Thanks for looking it up @jkzing 👍
Closing as dup of #5800