fix issue: #37 (comment)

Author: phphe

src/components/DraggableTreeNode.vue

@@ -45,6 +45,7 @@ export default {
             return autoMoveDragPlaceHolder.call(this, draggableHelperInfo)
           },
           drop: (e, opt, store) => {
+            autoMoveDragPlaceHolder.dragEnd()
             const draggableHelperInfo = {event: e, options: opt, store}
             if (this.store.ondragend && this.store.ondragend(this.data, draggableHelperInfo) === false) {
               hp.arrayRemove(dplh.parent.children, dplh)

src/components/Tree.vue

@@ -8,7 +8,6 @@
 <script>
 import * as hp from 'helper-js'
 import * as th from 'tree-helper'
-import * as ut from '../utils.js'
 import TreeNode from './TreeNode.vue'
 
 export default {

src/components/autoMoveDragPlaceHolder.js

@@ -155,7 +155,7 @@ for (const key of Object.keys(rules)) {
 
 let prevTree
 // context is vm
-export default function(draggableHelperInfo) {
+export default function autoMoveDragPlaceHolder(draggableHelperInfo) {
   const trees = this.store.trees
   const dhStore = draggableHelperInfo.store
   // make info
@@ -195,7 +195,7 @@ export default function(draggableHelperInfo) {
       if (currentTree) {
         const dragStartTree = this.store
         let treeChanged
-        if (dhStore.movedCount === 0) {
+        if (prevTree == null) {
           prevTree = dragStartTree
           treeChanged = true
         }
@@ -337,7 +337,6 @@ export default function(draggableHelperInfo) {
   })
   // attachCache end
 
-
   // decision start =================================
   const executedRuleCache = {}
   // exec rule
@@ -724,3 +723,7 @@ function getOf4(el, space) {
   r.y2 = r.y + el.offsetHeight + space
   return r
 }
+
+autoMoveDragPlaceHolder.dragEnd = function dragEnd() {
+  prevTree = null
+}