FormGroup.reset() does not reset validation

[farley911]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

FormGroup.reset() should reset the form validation

What is the current behavior?

FormGroup.reset() sets the form classes to ng-pristine and ng-untoched but FormControl.hasError(...) still returns truthy.

What are the steps to reproduce?

Plunker: http://embed.plnkr.co/Hlivn4/

• Create reactive form
• Add fields and set the validation to required
• Enter something into the fields
• Call FormGroup.reset() method

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

FormGroup.reset() should reset the form to it's initial state including removing validation errors.

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

Angular ^5.0.0, Material 5.0.0

Is there anything else we should know?

[willshowell]

Please see #4190 and particularly #4190 (comment).

If you want to customize under which conditions mat-error is shown, consider implementing your own ErrorStateMatcher.

[josephperrott]

Closing as duplicate of #4190

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