matches editor element's behavior


https://github.com/user-attachments/assets/f70912e1-5adb-403b-a98c-63e2e89929ac


- in first version editor scrolls like 1.5 pages, but agent panel only
scrolls half a page.
- in second version, agent panel also scrolls like 1.5 pages.

Release Notes:

- Fixed skipping of some scroll events in the non-uniform list UI element, which fixes slow scrolling of the agent panel.