mat-form-field required fields should remove the * when disabled #8251
Description
Bug, feature request, or proposal:
Proposal
What is the expected behavior?
When a mat-form-field has an input that is required and disabled, It should not append the asterisk to the label. This is useful when the enabled status is controlled by some other form state, It doesn't make sense to display an input as required (with a *) while it is disabled.
What is the current behavior?
The mat-form-field component always show the asterisk even when the form control is disabled.
What are the steps to reproduce?
https://stackblitz.com/edit/angular-material2-issue-uthrg2?file=app%2Fapp.component.html
What is the use-case or motivation for changing an existing behavior?
When control enable status is dynamic, the asterisk should be only shown when they are required and enabled, doing it manually requires doing always the enable state change and the required changed at the same time.
Which versions of Angular, Material, OS, TypeScript, browsers are affected?
Material 2.0.0-beta.12