fix(MdInput): placeholders don't float when MdInput value has bound expression

[0x-r4bbit]

Bug, feature request, or proposal:

When binding a value to MdInput using an expression, placeholder attribute (or md-placeholder) don't float when value is set, which results in placeholder text + input value to overlap. Also after focussing and blurring the input, the placeholder goes back to its original position. However, when using a static value, it works perfectly fine.

What is the expected behavior?

placeholder attribute (and/or MdPlaceholder) should float, also when initial MdInput value comes from an expression.

What are the steps to reproduce?

1. Create a property on component (foo="bar")
2. Bind property to MdInput and give it a placeholder (placeholder="Some Placeholder")

Here's a Plunk that reproduces the bug: https://plnkr.co/edit/NnwmYrakshZ5DEBkW27D?p=preview

Is there anything else we should know?

There's an issue that might be related to this bug. When setting form values programmatically, placeholder positions also aren't updated. This issue can be found here: #2441

Someone came up with a fix for that as well: crisbeto@72bc742

[devversion]

Just confirmed that this will be fixed with #2455.

• Here is a Plunker with an UMD bundle from PR fix(input): properly determine input value #2455, which shows that it works: Plunker

[0x-r4bbit]

@devversion Wow, thanks for the quick reply!! I haven't found that PR right away, would've otherwise not opened this issue. I'll leave it open though, until #2455 is merged!

Thanks so much!

[devversion]

@PascalPrecht No worries. Thanks for the issue 😄 I will reference your issue, so it will be closed once the PR is merged.

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