Bug: md-prefix stretches together with input field

[Parez]

When I put prefix in a wide md-input-container, the prefix stretches together with it.
Easy to reproduce. Just make the md-input-container wide enough:
<md-input-container class="full-width">
<span md-prefix>#</span>
<input md-input formControlName="tagInput" placeholder="Tags>
</md-input-container>

Have a look at the copyright and hash prefixes here:

I believe prefixes should stay the same width not dependent on the parent width.

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Another thing (not sure if it was already mentioned) - fields disabled via code .disable() do not display as dotted. Also visible on the screenshot (field to the left of checkbox is actually disabled).

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