DataTable: "Row Group" doesn't work correctly with virtual scrolling

[M-U-X]

Describe the bug

DataTable's "Row Group" doesn't work correctly with virtual scrolling, past the initial list of items loaded, it breaks and apparently tries to inset the group header after each item, also there's a slight spacing between the group header and table header under which items scrolling up can be partially seen, but that seems like a general style issue and not related to virtual scrolling per se.

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://stackblitz.com/edit/primevue-4-vite-issue-template-6kwoifer?file=src%2FTable.vue

Environment

Windows 11, Visual studio code

Vue version

3.5.13

PrimeVue version

4.3.1

Node version

23.6.0

Browser(s)

No response

Steps to reproduce the behavior

NA

Expected behavior

Same behavior as a table with virtual scroll disabled

[Tamas-hi]

Sadly this is a long standing issue: #4109