src/vs/workbench/contrib/notebook/browser/view/renderers/cellDnd.ts/CellDragAndDropController/dragCleanup
class CellDragAndDropController:	private dragCleanup(): void {
		if (this.currentDraggedCell) {
			this.currentDraggedCell.dragging = false;
			this.currentDraggedCell = undefined;
		}

		this.setInsertIndicatorVisibility(false);
	}