[mat-menu] floats outside window

[vegarda]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

mat-menu to be contained below top and above bottom

What is the current behavior?

mat-menu expands up outside window

What are the steps to reproduce?

https://material.angular.io/components/menu/overview
Adjust window until menu floats outside window

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

Menu items become unreachable

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

Angular 5.2.5
Material 5.2.1

Is there anything else we should know?

Example below where mouse is howering on top element

[julianobrasil]

I think this other issue has the same root cause: #6965

If so, have a look over there, speciffically from #6965 (comment)

[josephperrott]

Closing as duplicate of #6965

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