mat-tab-group with mat-stretch-tabs stretches tab groups inside it

[xernobyl]

Bug, feature request, or proposal:

When adding a mat-tab-group inside a mat-tab-group with mat-stretch-tabs it behaves as if if it has mat-stretch-tabs.

What is the expected behavior?

A mat-tab-group inside a stretching mat-tab-group with mat-stretch-tabs shouldn't stretch.

What is the current behavior?

A mat-tab-group inside a stretching mat-tab-group with mat-stretch-tabs stretches.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue

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

TABCEPTION

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

6.3.3

Is there anything else we should know?

No, you're smart.

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