I would like to have my source model to remain unchanged after dragging one element away.
Here is what i have sofar: 
component.ts:

```
constructor(private dragulaService: DragulaService) {
    this.dragulaService.dropModel('DragItems').subscribe(dropItem => {
        this.text += dropItem.item.data;
    });
}

```

component.html:

```html
<ul [dragula]="'DragItems'" [dragulaModel]="datas">
    <li *ngFor="let data of datas">
        <div class="list-item-class">
            {{data.value}}
        </div>
    </li>
</ul>

```

In my target field i already have some text and get the value of the dragged item appended to the end of the existing text, but the dragged item disappears. Thank you for your help!