Quickly toggling expansion panel leaves it in undefined state

[willshowell]

Bug, feature request, or proposal:

Bug

Current behavior

Reproduction

http://plnkr.co/edit/PaoRWzPQe29y1x7BBnvr?p=preview

Is there anything else we should know?

Maybe similar to #4932?

[willshowell]

Note that to replicate

1. Start with the panel open
2. Quickly close -> open

[crisbeto]

Another way is to slow down the animation and toggle between accordions.

[willshowell]

I think you've mentioned it elsewhere, but here's a plunker showing that it is likely a bug in angular/[email protected]:

http://plnkr.co/edit/1Lk0pj6B9V1lCFqSlms8?p=preview

Do the same thing to replicate:

1. Start with panel open
2. Quickly close -> open

[willshowell]

The original issue seems to be fixed with the latest animations updates, but the toggle icon still rotates the wrong way when quickly closing and then opening.

[crisbeto]

Closing since I'm having a hard time reproducing it anymore and even in that case the issue is on the @angular/animations side.

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