Tree horizontal scroll

[saskliutas]

Describe the bug (current behavior)

Selected and hovered TreeNode styling is off when Tree component has horizontal scroll.

Expected Behavior

It was possible to add horizontal scroll to the Tree component in 3.12.0 version and styling of TreeNode was alright: https://stackblitz.com/edit/github-mmlry8-kslxf8

Link to minimal repro

https://stackblitz.com/edit/github-mmlry8-pkdhkj

Steps To Reproduce

1. Expand Tree couple levels deep.
2. Select nodes from different levels.
3. Scroll to the right.
4. Selected nodes in different levels have different size outline and active background coloring.

Package Version

• I'm using the latest version of iTwinUI.

Anything else?

No response

[r100-stack]

Thanks for reporting this issue.

We noticed this issue shortly after changing our inner virtualization implementation in 3.13.0. We addressed part of it in #2170, which was released in 3.13.4. We had a draft PR to try to fix the remaining parts but had to close it since it turned out to be more involved. I took some time today to investigate this but couldn't come up with a quick solution as of now.

But we added this to our backlog and will investigate it deeper in the near future.