🐛 TreeView's focus always starts at first or last item

Describe the bug When using the arrow keys or the tab key to move the focus, the focus always starts on the first (down arrow, tab) or last item (up arrow) instead at the item that was invoked last:

Expected behavior When using the keyboard to move the focus, the focus should start at the item that was invoked last, like can be seen in the WinUI 3 Gallery:

I had a look at this, but I think this kind of behavior is not a reality in the current flutter focus system. Would love some extra help here!

https://docs.flutter.dev/ui/advanced/focus