src/vs/workbench/contrib/notebook/browser/view/renderers/cellDnd.ts/CellDragAndDropController/getDropInsertDirection
class CellDragAndDropController:	private getDropInsertDirection(dragPosRatio: number): 'above' | 'below' {
		return dragPosRatio < 0.5 ? 'above' : 'below';
	}