mat-vertical-stepper with long label shrink the circle number

[fatalcaron]

Bug:

When you have long label and you fall in text overflow (with the ...) the circle number is shrink

What are the steps to reproduce?

StackBlitz: https://stackblitz.com/edit/stepper-vertical-bug?file=app/stepper-overview-example.html

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

Angular: 5.2.8
Angular material: 5.2.4

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