Transition leave-to class is not being removed properly

[jkzing]

Version

2.5.13

Reproduction link

https://jsfiddle.net/ace7s75e/

Steps to reproduce

1. Click on "Show/Hide" button;
2. Switch to another browser tab (you have only 2 seconds to do it);
3. Go back to JsFiddle and see that the message is not displayed.

What is expected?

1. After clicking on "Show/Hide" button the fiddle waits for 2 seconds and hides the message.
2. Then the fiddle waits for 1 more second and shows up the message.

What is actually happening?

After clicking on "Show/Hide" button and switching to another browser tab during those 2 seconds - when you come back you will not see the message, because of class="fade-leave-to" in

-element.

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on behave of #5800 (comment)