BI-134635 fix: 空白问题，高度初始化

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

@@ -26,6 +26,7 @@ export class VirtualGroupList extends Widget {
 
     init() {
         this.renderedIndex = -1;
+        this._initSummaryHeight();
     }
 
     static xtype = "bi.virtual_group_list";
@@ -44,7 +45,7 @@ export class VirtualGroupList extends Widget {
                 },
                 {
                     type: VirtualGroup.xtype,
-                    height: rowHeight * items.length,
+                    height: this.summaryHeight,
                     ref: (ref) => {
                         this.container = ref;
                     },
@@ -83,8 +84,10 @@ export class VirtualGroupList extends Widget {
             o.scrollTop = this.element.scrollTop();
             if (!this.ticking) {
                 requestAnimationFrame(() => {
+                    const start = new Date().getTime();
                     this._calculateBlocksToRender();
                     this.ticking = false;
+                    console.log(new Date().getTime() - start);
                 });
                 this.ticking = true;
             }
@@ -200,16 +203,21 @@ export class VirtualGroupList extends Widget {
     _restore() {
         const o = this.options;
         this.renderedIndex = -1;
-        if (isFunction(o.rowHeight)) {
-            this.summaryHeight = sum(o.items, o.rowHeight);
-        } else {
-            this.summaryHeight = this._isAutoHeight() ? 0 : o.rowHeight * o.items.length;
-        }
+        this._initSummaryHeight();
         // 依赖于cache的占位元素也要初始化
         this.topBlank.setHeight(0);
         this.bottomBlank.setHeight(0);
     }
 
+    _initSummaryHeight() {
+        const { rowHeight, items } = this.options;
+        if (isFunction(rowHeight)) {
+            this.summaryHeight = sum(items, rowHeight);
+        } else {
+            this.summaryHeight = this._isAutoHeight() ? 0 : rowHeight * items.length;
+        }
+    }
+
     // 暂时只支持固定行高的场景
     scrollTo(scrollTop) {
         this.options.scrollTop = scrollTop;