fix: select not scroll, close #5082

Author: tangjinzhou

components/vc-virtual-list/Item.tsx

@@ -1,12 +1,13 @@
 import type { FunctionalComponent, PropType } from 'vue';
 import { cloneVNode } from 'vue';
+import { flattenChildren } from '../_util/props-util';
 
 export interface ItemProps {
   setRef: (element: HTMLElement) => void;
 }
 
 const Item: FunctionalComponent<ItemProps> = ({ setRef }, { slots }) => {
-  const children = slots.default?.();
+  const children = flattenChildren(slots.default?.());
 
   return children && children.length
     ? cloneVNode(children[0], {

components/vc-virtual-list/List.tsx

@@ -224,15 +224,6 @@ const List = defineComponent({
         if (!useVirtual.value || !inVirtual.value) {
           return;
         }
-        if (!inVirtual.value) {
-          Object.assign(calRes, {
-            scrollHeight: offsetHeight.value,
-            start: 0,
-            end: mergedData.value.length - 1,
-            offset: undefined,
-          });
-          return;
-        }
 
         let itemTop = 0;
         let startIndex: number | undefined;