bug(material/list): can tab to a disabled list when selecting an item before disabling it

[zarend]

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

Selecting an item in a list, then disabling the list leaves the selected item in the tab order. Should never be able to tab to the list after disabling it.

Reproduction

Steps to reproduce:

1. Open "https://material2-dev.web.app/list"
2. Navigate to "Selection list"
3. (Notice options "Bananas, Oranges, etc.")
4. Click "Bananas"
5. Click "Disable Selection List"
6. Press shift + tab twice

Expected Behavior

Focus is not on the "Selection list"

Actual Behavior

Focus is on the "Selection list"

Environment

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

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