Describe the bug

According to my understanding, the ARIA requirements say that, when the node is closed, pressing RIGHT should open the children, but not change focus.

Currently, pressing RIGHT open the children and changes focus to the first child.

Reproducer

No response

System Information

Irrelevant

Steps to reproduce the behavior

1. Tab to focus a Tree item
2. Press Arrow Right

Expected behavior

3. Children are exposed
4. Focus not changed