fix(Draggable): rootDraggable does not work

affects: @he-tree/vue2, @he-tree/vue3

ISSUES CLOSED: #19

Author: phphe

packages/vue2/src/draggable/Draggable.vue

@@ -262,6 +262,12 @@ export default class Draggable extends BaseTree {
           if (!isNodeDraggable(store.draggingNode)) {
             return false;
           }
+          if (
+            store.startTree.rootDraggable === false &&
+            store.draggingNode.$level === 1
+          ) {
+            return false;
+          }
           if (this.ondragstart && this.ondragstart(store) === false) {
             return false;
           }

packages/vue3/src/draggable/Draggable.vue

@@ -263,6 +263,12 @@ export default defineComponent({
           if (!isNodeDraggable(store.draggingNode)) {
             return false;
           }
+          if (
+            store.startTree.rootDraggable === false &&
+            store.draggingNode.$level === 1
+          ) {
+            return false;
+          }
           if (this.ondragstart && this.ondragstart(store) === false) {
             return false;
           }