bug(Autocomplete): does not lock scroll other than to its panel if opened

[RobinKamps]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

This may sound familiar as it is a long known issue - but perhaps with a new suggestion how to fix it.

The autocomplete panel position is bound to body/html scroll events for performance reasons.
However adding cdkScrollable on a parent scrollable div can fix the issue (may result in performance loss/flickering).
But even if the autocomplete is in a scrollable scope the scrolling may lead to bad side effects (z-index, etc.): e.g. the demo for 15.0.0:

Since all other components (menu, select etc.) lock the scrolling of the body/underlaying scroll div, when opened - the same user experience for the autocomplete panel would be great.

Reproduction

Steps to reproduce:

1. https://material.angular.io/components/autocomplete/examples -> open panel and scroll
2. https://material.angular.io/components/select/examples -> open panel and scroll

Expected Behavior

autocomplete should have a similar scrolling behaviour as other components

Actual Behavior

autocomplete does not prevent scrolling the underlying element

Environment

• Angular: 15
• CDK/Material: 15

[AurelienLoyer]

Same issue here, looking for a solution 😢

[amysorto]

Duplicate of #26484

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