Fix scrollbar flicker when streaming agent2 response (#36606)
This was caused by calling `list_state.splice` on updated entries. We
don't need to splice the entry, as we'll recompute its measurements
automatically when we render it.
Release Notes:
- N/A
d0fb6120d9Antonio Scandurra committed on 8/20/2025, 4:39:46 PM· committed by GitHubparent699f58a