Calendar keyboard navigation: inline calendar Shift + Tab does not work.

[jennylgh]

Describe the bug

When calendar inner focusable elements receives focus, Shift + Tab does not work.

There is a similar issue created. But it's closed with comments that it will be fixed in later version. As of version 3.4.17, issue is still reproducible

Reproducer

https://codesandbox.io/s/wizardly-wave-wj1yx8?file=/src/App.vue

PrimeVue version

3.4.17

Vue version

3.x

Language

ALL

Build / Runtime

Vue CLI App

Browser(s)

ALL

Steps to reproduce the behavior

Go to CodeSandbax demo page:

1. Start tabbing until focus comes to calendar header Prev Month icon
2. Keep pressing Shift + Tab, observe next element that has focus.

Expected behavior

Focus should return to previous focusable tags.

Actual: focus is stuck inside calendar.