
Previously, when the content extent changed during a scroll interaction, we'd stop the current scroll interaction and reset the scroll offset. Now we try to continue the scroll interaction (e.g., drag, fling, or overscroll) even through the underlying scroll behavior has changed. For physics-based scroll interactions, we keep the current position and velocity and recompute the operative forces. For drag interactions, we keep the current position and continue to let the user drag the scroll offset. After this patch, we still disrupt non-physical scroll animations that are operating outside the new scroll bounds because it's not clear how we can sensibly modify them to work with the new scroll bounds.
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