Prevent every row from unmounting when one row is deleted

Author: salhotra

src/SortableList.js

@@ -117,7 +117,6 @@ export default class SortableList extends Component {
 
     if (data && nextData && !shallowEqual(data, nextData)) {
       nextOrder = nextOrder || Object.keys(nextData)
-      uniqueRowKey.id++;
       this._rowsLayouts = {};
       nextOrder.forEach((key) => {
         this._rowsLayouts[key] = new Promise((resolve) => {
@@ -126,6 +125,7 @@ export default class SortableList extends Component {
       });
 
       if (Object.keys(nextData).length > Object.keys(data).length) {
+        uniqueRowKey.id++;
         this.setState({
           animated: false,
           data: nextData,