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kilyabin
059900e85e
The spring model (velocity × damping per rAF frame) produced an abrupt-looking lurch on each line change — especially noticeable at the stiffness/damping values used (0.1 / 0.78). Replace SpringScroller with EaseScroller: a fixed-duration (650 ms) cubic ease-out animation that starts from the current scroll position and decelerates smoothly to the target. Restarting mid-flight is clean — the next call captures the container's current scrollTop as the new start point, so fast line changes never skip or jerk. Applied to both the fullscreen Apple-style lyrics and the sidebar LyricsPane. User-scroll cancellation (stop() + 4 s resume) is preserved unchanged.