MdRadioGroup is marked "not pristine" when setValue(...) is called

[feloy]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

In a reactive Form, when calling setValue(...) method of a formControl, the formControl should not be marked as not pristine.

What is the current behavior?

A MdRadioGroup in a reactive form is marked as not pristine when setValue(...) is called on the control form.

What are the steps to reproduce?

View github https://github.com/feloy/ng2-master-detail

• tag bug-dirty-ok : works as expected with input radio
• tag bug-dirty-error : does not work as expected with md-radio-button

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

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

Angular 2.0.2
Material 2.0.0-alpha.9-3
OS Linux
Browsers tested: Chrome 50, Firefox 46

Is there anything else we should know?

[feloy]

More details:
Here is the comment @angular/forms describing that a form control should not be marked ditry when changed programmatically:
https://github.com/angular/angular/blob/master/modules/%40angular/forms/src/model.ts#L180

I also see an error in the radio tests, where it is tested that the control should become dirty after being changed programmatically:
https://github.com/angular/material2/blob/master/src/lib/radio/radio.spec.ts#L283

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