FormsModule: untouched text input is not pristine in IE 11

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Current behavior When showing a form in IE 11 with an input field, the initial state of the field is not pristine, leading to error messages being shown to the user before he touched the field.

Expected behavior The field state should be pristine until the user first entered and removed some text. This works fine in e.g. Google Chrome

Minimal reproduction of the problem with instructions http://embed.plnkr.co/fm7lH2/ The red error message should only be display when the user entered and removed some text.

What is the motivation / use case for changing the behavior? Form validation errors should only be displayed when a user touched the form.

Please tell us about your environment: Windows 7 / IE 11

• Angular version: 2.4.7

• Browser: IE 11

• Language: TypeScript

• Node (for AoT issues): node --version = v6.3.1

[mmalerba]

It looks like the source of this bug is the fact that MdInputDirective sets up an @Input() on placeholder and then re-binds it in the host. Ideally this should be fixed in angular core.

Here’s an example of this happening with pure angular, no material: http://plnkr.co/edit/cpLxYzEVceJ4MUGiOXi5?p=preview

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