md-select placeholder does not reset on quick close

[ottosson]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Placeholder text should return to original position when closing menu before animation is done, if no value has been selected.

What is the current behavior?

If menu is closed before placeholder text animation is done, the placeholder text will stay over the component as if value was selected.

What are the steps to reproduce?

Open md-select menu and close it quickly (press escape or mouse click outside menu) before menu/placeholder animation finishes.

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What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 4.2.5, Material 2.0.0.beta.8

Is there anything else we should know?

[crisbeto]

Closing as a duplicate of #4932.

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