Mat-select lacks disabled (readonly) option

Reproduction

Steps to reproduce:

1. Create a project
2. Add Angular material to the project
3. Create a form with fieldset in it and mat-select in it (form -> fieldset -> mat-select)
4. Add [disabled] to fieldset inside form tag to be true on submit
5. Force disabled to become true
6. Observe mat-select that user can interact with even though they should not

Expected Behavior

Selector should be disabled.

Actual Behavior

It is not.

Additional info

I’ve read that mat-select has no readonly state because “native select doesn’t have it”, HOWEVER I want to point that when you make fieldset disabled the native selector disables and the user CANNOT modify value on form sumit. BUT when using Angular material user CAN change the value during submit even though it is inside fieldset[disabled].

This makes it tricky to work with forms non-stop (for example when you can submit form, then form needs to be locked until it’s submitted, after that you enable form and reset it’s submitted state and let the user change/save the form again).