When dragging in ReorderableListView, the items that shift to make room exhibit jumping behavior if drag direction is reversed before their animations complete.

Steps to Reproduce:

1. Create a ReorderableListView with items
2. Drag an item over others (causing them to animate out of the way)
3. Before those animations complete, drag back in the opposite direction
4. The shifting items jump instead of smoothly reversing

Expected:
Items making room should smoothly transition from their current animated position when drag direction changes.

Actual:
Items snap back to their original positions before animating to new targets, causing visual jumps.

Environment:

• Flutter version: stable channel
• Platform: all platforms