Components: Stepper header without icons

[tatsujb]

Bug, feature request, or proposal:

Bug/feature request

What is the expected behavior?

Just display numbers in stepper headers

What is the current behavior?

Tries to display "create" in the icon after changing to another step

What are the steps to reproduce?

https://stackblitz.com/edit/angular-vpoj5j you can see it here

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

Not everyone uses the icons

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

Angular 8.2.14
typescript 3.5.3

Is there anything else we should know?

I know I can override the icons, however I'm unsure about changing it to always using the 'number' state.
The UX of changing the stepper to these icons doesn't really appeal to me.

Additional info

doing this :

<mat-horizontal-stepper>
  <ng-template matStepperIcon="edit"></ng-template>
  <ng-template matStepperIcon="done"></ng-template>

  <mat-step>...</mat-step>
</mat-horizontal-stepper>

does not do it. the pencil icon continues to appear for opened states

[tatsujb]

this, however :

@ViewChild(MatHorizontalStepper) stepper: MatHorizontalStepper;


ngAfterViewInit() {
  this.stepper._getIndicatorType = () => 'number';
}

does work but is less than ideal.

[samclaus]

This is 100% a bug because numbers are shown when I use the stepper, but as soon as I visit a step and then switch to another step that step begins using <mat-icon>create</mat-icon> which just renders as text because I don't use the Material Icons library.