Mat-Vertical-Stepper incompatible with Mat-Tab

Bug, feature request, or proposal:

Bug

What is the expected behavior?

In a Mat-Vertical-Stepper, by default only the active step should be expanded.

What is the current behavior?

In my Mat-Vertical-Stepper by default every step is expanded. It seems that this issue is only when I have the Mat-Vertical-Stepper as a child to a Mat-Tab.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-t4bexd

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

I need the space in my registration form to be as small as possible. I'd rather not have too much to overflow onto a scroll area.

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

Angular CLI: 1.6.7
Node: 9.5.0
OS: win32 x64
Angular: 5.2.3
Chrome Browser

Is there anything else we should know?

No

[julianobrasil]

This is likely to be solved when PR #8921 is merged.

[josephperrott]

Closing as this was addressed by #8921

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