bug(matAutocomplete): Autocomplete not opening with shadow DOM

[XavierDupessey]

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

Hello,

The MatAutocomplete does not open when starting writing text if the Shadow DOM encapsulation is used.
We have to click to trigger the opening.

Without Shadow DOM encapsulation (working):
https://github.com/user-attachments/assets/911e3de9-83c3-412e-a87e-6f994298fead

With Shadow DOM encapsulation (NOT working):
https://github.com/user-attachments/assets/c0ced996-2bf9-40d5-84ba-d2d5e490e10a

Thank you,
Xavier

Reproduction

Checkout: https://github.com/XavierDupessey/ng-14-mat-autocomplete-issue
Run: npm start
Open http://localhost:4200

Expected Behavior

The autocomplete should open when entering text even when Shadow DOM encapsulation is enabled.

Actual Behavior

Select a value from the autocomplete, then input text to search another one: the autocomplete does not open.

Environment

• Angular: 14
• CDK/Material: 14
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

[crisbeto]

Closing since this is an issue against an old version of Angular. The autocomplete seems to work in the shadow DOM in the latest version.

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