bug(DomPortalOutlet): hasAttached returns false after attachComponentPortal

[fcostarodrigo]

Reproduction

Use StackBlitz to reproduce your issue:
https://stackblitz.com/edit/angular-ivy-b4babe?file=src/app/app.component.ts

Steps to reproduce:

1. Attach a component portal.
2. Call has attached method.

Expected Behavior

What behavior were you expecting to see?
Return true.

Actual Behavior

What behavior did you actually see?
Return false.

Environment

• Angular: 11.2.7
• CDK/Material: 11.2.6
• Browser(s): Firefox
• Operating System (e.g. Windows, macOS, Ubuntu): macOS

Notes

The attach works fine, the issue happens because calling attachComponentPortal directly won't set _attachedPortal and hasAttached won't work as expected. A solution would be the attachs specific methods set _attachedPortal or make the attaches methods private if they are not meant to be called.

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