fix(stepper): ensure step state is not minified

Author: mmalerba

src/lib/stepper/step-header.html

@@ -3,45 +3,12 @@
      [ngSwitch]="state">
 
   <div class="mat-step-icon-content">
-    <ng-container *ngSwitchCase="'number'" [ngSwitch]="!!(iconOverrides && iconOverrides.number)">
-      <ng-container
-        *ngSwitchCase="true"
-        [ngTemplateOutlet]="iconOverrides.number"
-        [ngTemplateOutletContext]="_getIconContext()"></ng-container>
-      <span *ngSwitchDefault>{{index + 1}}</span>
-    </ng-container>
-
-    <ng-container *ngSwitchCase="'edit'" [ngSwitch]="!!(iconOverrides && iconOverrides.edit)">
-      <ng-container
-        *ngSwitchCase="true"
-        [ngTemplateOutlet]="iconOverrides.edit"
-        [ngTemplateOutletContext]="_getIconContext()"></ng-container>
-      <mat-icon *ngSwitchDefault>create</mat-icon>
-    </ng-container>
-
-    <ng-container *ngSwitchCase="'done'" [ngSwitch]="!!(iconOverrides && iconOverrides.done)">
-      <ng-container
-        *ngSwitchCase="true"
-        [ngTemplateOutlet]="iconOverrides.done"
-        [ngTemplateOutletContext]="_getIconContext()"></ng-container>
-      <mat-icon *ngSwitchDefault>done</mat-icon>
-    </ng-container>
-
-    <ng-container *ngSwitchCase="'error'" [ngSwitch]="!!(iconOverrides && iconOverrides.error)">
-      <ng-container
-        *ngSwitchCase="true"
-        [ngTemplateOutlet]="iconOverrides.error"
-        [ngTemplateOutletContext]="_getIconContext()"></ng-container>
-      <mat-icon *ngSwitchDefault>warning</mat-icon>
-    </ng-container>
-
-    <!-- Custom state. -->
     <ng-container *ngSwitchDefault [ngSwitch]="!!(iconOverrides && iconOverrides[state])">
       <ng-container
         *ngSwitchCase="true"
         [ngTemplateOutlet]="iconOverrides[state]"
         [ngTemplateOutletContext]="_getIconContext()"></ng-container>
-      <mat-icon *ngSwitchDefault>{{state}}</mat-icon>
+      <mat-icon *ngSwitchDefault>{{_getDefaultIconForState(state)}}</mat-icon>
     </ng-container>
   </div>
 </div>

src/lib/stepper/step-header.ts

@@ -101,4 +101,14 @@ export class MatStepHeader extends CdkStepHeader implements OnDestroy {
       optional: this.optional
     };
   }
+
+  _getDefaultIconForState(state: string): string {
+    if (state == 'number') {
+      return `${this.index + 1}`;
+    }
+    return ({
+      'edit': 'create',
+      'error': 'warning',
+    } as {[key: string]: string})[state] || state;
+  }
 }