KERNEL-14885 fix: virtualgrouplist 爆栈

packages/fineui/src/base/list/virtualgrouplist.js

@@ -38,15 +38,15 @@ export class VirtualGroupList extends Widget {
             items: [
                 {
                     type: Layout.xtype,
-                    ref: () => {
-                        this.topBlank = this;
+                    ref: (ref) => {
+                        this.topBlank = ref;
                     },
                 },
                 {
                     type: VirtualGroup.xtype,
                     height: rowHeight * items.length,
-                    ref: () => {
-                        this.container = this;
+                    ref: (ref) => {
+                        this.container = ref;
                     },
                     layouts: [
                         extend(
@@ -60,8 +60,8 @@ export class VirtualGroupList extends Widget {
                 },
                 {
                     type: Layout.xtype,
-                    ref: () => {
-                        this.bottomBlank = this;
+                    ref: (ref) => {
+                        this.bottomBlank = ref;
                     },
                 }
             ],