Listbox: OptionGroup disappear with filter

[lilhottied]

Describe the bug

The problem is if I use optionGroups and Filter within the same Listbox component, When I filter, the filtered value hasn't render the optionGroups. Is there any solution for this?

Reproducer

https://stackblitz.com/edit/qshngr?file=src%2FApp.vue

PrimeVue version

4.0.0-rc.2

Vue version

4.x

Language

ES6

Build / Runtime

Vite

Browser(s)

All

Steps to reproduce the behavior

1. Click on the Listbox component.
2. Enter the desired value in the search filter input field.
3. Check the result: Notice that the optionGroups are not displayed.

Expected behavior

1. Click on the Listbox component.
2. Enter the desired value in the search filter input field.
3. Check the result: The optionGroup labels corresponding to each optionChild should be displayed.

[avramz]

Can reproduce, fix in PR