BI-138976 fix: 计算高度

(cherry picked from commit 2a547dca1e)

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

@@ -77,6 +77,7 @@ export class VirtualGroupList extends Widget {
                 this.populate(newValue);
             })
             : o.items;
+        this._calculateSummaryHeight();
         this._populate();
         this.ticking = false;
         this.element.scroll(() => {
@@ -169,6 +170,16 @@ export class VirtualGroupList extends Widget {
             );
         }
     }
+
+    _calculateSummaryHeight() {
+        const o = this.options;
+        if (isFunction(o.rowHeight)) {
+            this.summaryHeight = sum(o.items, o.rowHeight);
+        } else {
+            this.summaryHeight = this._isAutoHeight() ? 0 : o.rowHeight * o.items.length;
+        }
+    }
+
     _populate(items) {
         const { blockSize, rowHeight, scrollTop } = this.options;
         if (items && this.options.items !== items) {
@@ -198,13 +209,8 @@ export class VirtualGroupList extends Widget {
     }
 
     _restore() {
-        const o = this.options;
         this.renderedIndex = -1;
-        if (isFunction(o.rowHeight)) {
+        this._calculateSummaryHeight();
-            this.summaryHeight = sum(o.items, o.rowHeight);
-        } else {
-            this.summaryHeight = this._isAutoHeight() ? 0 : o.rowHeight * o.items.length;
-        }
         // 依赖于cache的占位元素也要初始化
         this.topBlank.setHeight(0);
         this.bottomBlank.setHeight(0);