bug(mat-chip): Cannot shift+tab out of a focused mat-chip-listbox

[menuka-s]

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

14.2.7

Description

When focused in a <mat-chip-listbox> a user cannot shift+tab to the previous element.

Reproduction

Steps to reproduce:

1. Tab to <mat-chip-listbox>
2. Try shift+tab to tab out of the <mat-chip-listbox>

Stackblitz

Expected Behavior

A user should be able to press shift+tab to focus back to the previous element.

Actual Behavior

When pressing shift+tab, the focus remains on a the <mat-chip-listbox>. If a value is selected, then the focus returns to that selected <mat-chip>.

Environment

• Angular: 15
• CDK/Material: 15.2
• Browser(s): Chrome, Edge, Firefox
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

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