Pull request #3662: 无JIRA任务 custom_tree + bi.loader，populate的时候会导致“无更多数据”消失

Merge in VISUAL/fineui from ~GUY/fineui:master to master

* commit '262308f619e75bc52eec07fb6be693cc4a6cbf7c':
  无JIRA任务 custom_tree支持hasNext
  无JIRA任务 custom_tree + bi.loader，populate的时候会导致“无更多数据”消失
  无JIRA任务 custom_tree + bi.loader，populate的时候会导致“无更多数据”消失

packages/fineui/src/base/tree/customtree.js

@@ -123,9 +123,8 @@ export class CustomTree extends Widget {
             itemsCreator: (op, callback) => {
                 itemsCreator.apply(this, [
                     op,
-                    items => {
-                        const args = Array.prototype.slice.call(arguments, 0);
-                        args[0] = this._formatItems(items);
+                    (...args) => {
+                        args[0] = this._formatItems(args[0]);
                         callback(...args);
                     }
                 ]);