fix: "Uncaught Invariant Violation: Expected to find a valid target." after cancelling a drag into the react sortable tree (frontend-collective#740)

Co-authored-by: liangzenan <[email protected]>

Author: weirDozzz

src/react-sortable-tree.js

@@ -230,7 +230,7 @@ class ReactSortableTree extends Component {
     // it means that the drag was canceled or the dragSource dropped
     // elsewhere, and we should reset the state of this tree
     if (!monitor.isDragging() && this.state.draggingTreeData) {
-      this.endDrag();
+      setTimeout(() => {this.endDrag()});
     }
   }