Tree widget doesn't display higher elements until a user selects one

[williambrode]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

If you add elements to a tree that is not visible, then switch to view that tree (say with AppTabs), the tree will not render some elements at the top, until a user selects an element - at which point the whole tree will render.

How to reproduce

1. Clone the test case: https://github.com/williambrode/fyne-test-case/tree/TreeNotAppearingTillSelected
2. Run it and click "Rerpo"
3. Notice the tree does not render elements at the top.

Screenshots

No response

Example code

Full example here: https://github.com/williambrode/fyne-test-case/tree/TreeNotAppearingTillSelected

Fyne version

2.5.1

Go compiler version

1.22.3

Operating system and version

Windows 10

Additional Information

No response