Sharing one ScrollState across every row in the diff panels made each row's
layout pass overwrite the shared max-scroll bound with its own line width,
so the visible offset snapped back and forth mid-drag ("글자가 춤을 추네").
Replace it with a manually-driven offset clamped against one bound computed
once per file, instead of recomputed per row.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
choiminyeong
e2c25d8662