[bug] cdk-overlay causes cdk-virtual-scroll's middle click scroll to break

[JohnDeved]

What is the expected behavior?

when you press the middle mouse button you can drag to scroll.

What is the current behavior?

when you press the middle mouse button to drag-scroll, the page stops scrolling after a few centimeters

What are the steps to reproduce?

https://stackblitz.com/edit/hello-angular-6-tntkqc

1. use google chrome
2. use middle click scroll

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

Only Google Chrome is affected.
Firefox and Edge are working as expected.

Is there anything else we should know?

workarround is to document.querySelector<HTMLElement>('.cdk-overlay-container').hidden = true; while the user is scrolling

[JohnDeved]

problem seems to be fixed in newer versions

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