autoClose does not trigger detach event

[pawelkondraciuk]

Reproduction

Use StackBlitz to reproduce your issue: https://stackblitz.com/edit/components-issue-t4rpku

Steps to reproduce:

1. Check isOpen
2. Scroll down
3. Overlay is detached but "detached" is not console logged

Expected Behavior

Overlay should detach and call detach event when user scrolls away if reposition scroll strategy with autoClose option set to true is used

Related pull request: #8233

Actual Behavior

Overlay is detached while detach event is not being called

Environment

• Angular: 8.2.12
• CDK/Material: 8.2.3
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): macOSX/Ubuntu

[crisbeto]

This should be fixed by a PR that was opened a while ago: #7950. @jelbourn do you remember if there's a reason why we never ended up merging that PR?

[jelbourn]

The note says that it had a failing test internally- if it was really just one it probably wouldn't be too hard to revisit

[then3rdman]

Is this still in limbo? Issue is still existing

[then3rdman]

Um.... bump?