Cannot use *cdkVirtualFor on a <ng-container> when viewport is autosize.

[grant77]

Bug, feature request, or proposal:

Using *cdkVirtualFor on a ng-container causes error, "TypeError: view.rootNodes[j].getBoundingClientRect is not a function", when you start scrolling. This works, however, if I use a div instead. It also works if I use "itemSize" instead of "autosize" on the viewport.

What is the expected behavior?

No error when scrolling.

What is the current behavior?

I get an error when scrolling.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-7pzvdl?embed=1&file=app/app.component.html

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

Would like to be able to use ng-container instead of a div.

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

"@angular/cdk-experimental": "^6.4.0"

Is there anything else we should know?

No.

[crisbeto]

Looks like this was fixed in #12183.

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