feat(cdk/scrolling): Add support for nested for loop

Feature Description

The Angular Material cdk-virtual-scroll-viewport property is not working correctly for nested *ngFor. The viewport is split into two and the scroll does not work as expected. Please assist in listing in viewport with parent and child.

Use Case

<cdk-virtual-scroll-viewport itemSize="50">

 <div *cdkVirtualFor="let parent of parents">
    <h4>{{ parent.name }}</h4>
    <div>
      <div *ngFor="let child of children">
        <p>{{ child.name }}</p>
      </div>
    </div>
  </div>
</cdk-virtual-scroll-viewport>

[kramar]

Is it possible to run a new voting round for this one?

[angular-robot[bot]]

Thank you for submitting your feature request! Looks like during the polling process it didn’t collect a sufficient number of votes to move to the next stage.

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