Function drop

plugins/MultiDrag/MultiDrag.js:303–467

({ originalEvent: evt, rootEl, parentEl, sortable, dispatchSortableEvent, oldIndex, putSortable })

		},

		drop({ originalEvent: evt, rootEl, parentEl, sortable, dispatchSortableEvent, oldIndex, putSortable }) {
			let toSortable = (putSortable || this.sortable);

			if (!evt) return;

			let options = this.options,
				children = parentEl.children;

			// Multi-drag selection
			if (!dragStarted) {
				if (options.multiDragKey && !this.multiDragKeyDown) {
					this._deselectMultiDrag();
				}
				toggleClass(dragEl, options.selectedClass, !~multiDragElements.indexOf(dragEl));

				if (!~multiDragElements.indexOf(dragEl)) {
					multiDragElements.push(dragEl);
					dispatchEvent({
						sortable,
						rootEl,
						name: 'select',
						targetEl: dragEl,
						originalEvent: evt
					});

					// Modifier activated, select from last to dragEl
					if (evt.shiftKey && lastMultiDragSelect && sortable.el.contains(lastMultiDragSelect)) {
						let lastIndex = index(lastMultiDragSelect),
							currentIndex = index(dragEl);

						if (~lastIndex && ~currentIndex && lastIndex !== currentIndex) {
							// Must include lastMultiDragSelect (select it), in case modified selection from no selection
							// (but previous selection existed)
							let n, i;
							if (currentIndex > lastIndex) {
								i = lastIndex;
								n = currentIndex;
							} else {
								i = currentIndex;
								n = lastIndex + 1;
							}

							const filter = options.filter;

							for (; i < n; i++) {
								if (~multiDragElements.indexOf(children[i])) continue;
								// Check if element is draggable
								if (!closest(children[i], options.draggable, parentEl, false)) continue;
								// Check if element is filtered
								const filtered = filter && (typeof filter === 'function' ?
									filter.call(sortable, evt, children[i], sortable) :
									filter.split(',').some((criteria) => {
										return closest(children[i], criteria.trim(), parentEl, false);
									}));
								if (filtered) continue;
								toggleClass(children[i], options.selectedClass, true);
								multiDragElements.push(children[i]);