Virtual scrolling jumps around for large text items

[MiloradFilipovic]

Hey, I think there may be an issue with how scroll offset is calculated and applied in virtual scrolling when there are multi-line text values in JSON. Here's an example where the content jumps around while scrolling: https://github.com/user-attachments/assets/fa88830a-de70-4bc8-954b-48647d196f98

My best guess is that this is caused by using fixed item height when calculating transform values.