Is there a way to prevent the placeholder appearing when dragging into root level?

[flight9]

Our project have a constraint that there should only be one node at the root level.
So we use following codes to prevent that happening, it works:

dragEndHook(node) {
  return !node._vm.store.dplh.parent.isRoot; // return false to stop dropping
}

But we found the placeHolder still appears at root level, that may mislead our users by let them think the root level is permitted for node to be dropped.
Is there a way to prevent the placeholder appearing?

version:
vue-draggable-nested-tree 2.1.6

[phphe]

set rootnode.droppable = false

[flight9]

@phphe
I overwitten the dragstart hook with following codes, but the placeHolder still appears at root level.

    dragStartHook(node) {
      const rootNode = node._vm.store.rootData; // guess I got rootNode correctly
      this.$set(rootNode, 'droppable', false);
    },

Before dragging:

While dragging:

[phphe]

this is a bug. rootnode can't be set droppable false now. i will try to resolve it.

[flight9]

@phphe thanks for confirming

[phphe]

latest 2.1.7 should solve that