md-select field to validate on form submit even while pristine input

[kenhernando]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Upon submission of form, md-select should validate even while pristine

What is the current behavior?

Does not validate upon submitting untouched md-select field. Only validates after touching.

What are the steps to reproduce?

Updated plunker: https://embed.plnkr.co/UlyVEOfzFqJuzBnfccEz/

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

For user to easily know which field still needs to be filled up; to be consistent with md-input behavior.

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

Angular 4 - model driven forms

Is there anything else we should know?

Similar to this version 1 issue : https://github.com/angular/material/issues/8529

[willshowell]

Looks like your plunker is broken

[crisbeto]

Closing as a duplicate of #4611.

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