Multi-line input hint overlaps with elements below

[dobrevad]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Multi-line hint is properly wrapped in the input container. Doesn't overlap with other form fields below it.

What is the current behavior?

Multi-line hint is not supported. Overlaps with another input field below the current one.

What are the steps to reproduce?

https://plnkr.co/edit/gekgV5ULzXWrZE7VTHv1?p=preview

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

n/a

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

Angular v4.3.6, Material 2.0.0

Is there anything else we should know?

no

[jelbourn]

Duplicate of #5227

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