Multiselect: Last selected item is removed from selection when TABbing away from opened list

[konuch]

Describe the bug

This is mainly related to accessibility. When user opens a multiselect component, selects a few options and then presses TAB key to move to next/previous focusable item on the page, the last selected option gets deselected.

Environment

Windows 11

Reproducer

https://stackblitz.com/edit/github-p4anhh?file=src%2Fapp%2Fapp.component.html

Angular version

18.0.1

PrimeNG version

18.0.1-rc

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

20.18.0

Browser(s)

Chrome 131

Steps to reproduce the behavior

1. Open the multiselect dropdown and select several items.
2. Move to next/previous focusable item (Primeng Butotn in this case) using TAB key.
3. Last selected multiselect options is deselected

Expected behavior

All the selected multiselect options stay selected when navigating away from opened multiselect using TAB key.