[Virtual-scroll] reading DOM element dimension during scroll causing scroll back

[manzonif]

Reproduction

https://stackblitz.com/edit/components-issue-ooljyt

this is the basic cdk-virtual-scroll example plus the below few lines of code:

  ngAfterViewChecked() {
        const x = this.elementRef.nativeElement.scrollTop;
        console.log(x);

  }

Steps to reproduce:

1. Open in new window
2. scroll until Item 10

Expected Behavior

Scroll to Item 11, 12 and so on.

Actual Behavior

Scroll back to Item 5

Environment

• Angular:
• CDK/Material:
• Browser(s):
• Operating System (e.g. Windows, macOS, Ubuntu):

[manzonif]

No idea how to get around this problem?

[manzonif]

submitted a PR that fix this issue.

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