md-select errors still displayed even after resetting formGroup

Bug, feature request, or proposal:

Bug

What is the expected behavior?

after resetting the formGroup the error associated with md-select should disappear

What is the current behavior?

after resetting the formGroup the error associated with the md-select still displayed

What are the steps to reproduce?

Providing a StackBlitz/Plunker (or similar) is the best way to get the team to see your issue.
Plunker starter (using on @master): https://goo.gl/DlHd6U
StackBlitz starter (using latest npm release): https://goo.gl/wwnhMV

1. Create a formGroup with an md-select that is required for example
2. Reset the form after submission

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

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

Angular 4.3.3 Material 2.0.0-beta.11 Windows 10 Typescript 2.5.2 Browser Google Chrome 61.0.3163.100

Is there anything else we should know?

In order to reset the formGroup i use the technique described here : https://github.com/angular/material2/issues/4190

Thanks.

[willshowell]

After you reset the form, that is what happens. You are asking that by resetting your FormGroup, the FormGroupDirective is also reset. FormGroup and FormGroupDirective aren’t coupled in that way due to whatever design decisions were made in @angular/forms.

–

https://github.com/angular/material2/issues/4190#issuecomment-311488176 pretty much covers it:

1. Submitted state is based on the FormGroupDirective or the NgForm (depending on if you’re using template- or model-driven forms). FormGroup does not hold submitted state.

2. If you wish to reset the form, you must gain access to the FormGroupDirective or the NgForm and call resetForm() on it. That will remove .mat-input-invalid from the input and all associated md-errors

3. This behavior is in Angular core, not material. You are welcome to propose a change to the behavior, but that should be done in the angular core repository, not here.

4. If you simply don’t want .mat-input-invalid to depend at all on submitted state, you will be able to purpose https://github.com/angular/material2/pull/4750 for that once it lands.

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