Use drag event's dataTransfer
Abstraction for transferBetweenLists
Test copy functionality
Refactor droppable
Pub/sub for copy/paste updates
Better fn composition
Split out new-items functions
Better fn composition
Hover states for tools
Fix tools and sparks
CSS tweaks
 Disallow paste onto self
Paste directly into group, appends to its last item
Refactor storage
Better prop names
Remove redundant parent references
Fix remaining parent references
Remove id from update props
Omit group on latest articles copy
Fix latest articles drag