bug(aria): overlay panel jitters/lags on Y axis when scrolling the page while open (select, menu, listbox, etc.)

指定された Angular 22 環境を使用して、https://angular.dev/guide/aria/menu#example-1 の Angular Aria メニュー例で jitter を再現し、続いて @angular/aria の overlay の位置決めとスクロール処理を追跡します。スクロール中に select、メニュー、その他の overlay パネルが、Y 軸方向の目に見える遅延や jitter なしでトリガーとの位置関係を保てれば完了です。

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

Not sure, could not confirm if this was already present in Angular 21, since it's unclear whether @angular/aria was already used/present at that version

Description

When an overlay panel from @angular/aria is open (e.g. a select dropdown, a menu, or any other @angular/aria primitive that renders an overlay panel positioned relative to a trigger element), and the user scrolls the underlying page from bottom to top while keeping the overlay open, the panel fails to stay visually attached to its trigger/origin element on the Y axis. Instead of tracking the trigger smoothly, the panel appears to "shake" or lag behind, producing a jittery/sliding effect instead of staying cleanly pinned to its anchor.

This is reproducible directly on the official Angular Material/Aria documentation site (Angular v22 docs), e.g. on the select (aria) demo, so it does not require a custom StackBlitz repro to observe — though a StackBlitz reproduction will be added for completeness.

Reproduction

1. Go to an Angular Aria demo page that uses an overlay-based primitive (e.g. select) on the Angular v22 docs, e.g.
   https://angular.dev/guide/aria/menu#example-1
2. Click the trigger to open the overlay panel (dropdown/menu/etc.).
3. While the overlay remains open, scroll the underlying page from bottom to top (mouse wheel, trackpad, or scrollbar) — do not close the overlay.
4. Observe the overlay panel's position on the Y axis while scrolling.

Expected Behavior

The @angular/aria overlay panel should stay perfectly attached/aligned to its origin trigger element on the Y axis throughout the scroll, repositioning smoothly and immediately as the trigger's position changes, with no visible lag or jitter.

Actual Behavior

The overlay panel lags behind the scroll position and "shakes"/slides in a jittery manner on the Y axis instead of staying cleanly attached to its origin element. This happens specifically when scrolling from bottom to top while the @angular/aria overlay (select, menu, etc.) is open.

Environment

• Angular: 22.0.7
• CDK/Material: 22.0.5 (@angular/cdk 22.0.5, @angular/aria 22.0.5)
• Browser(s): Chrome
• Operating System: Windows