fix: 修复DatePickerPro打开日历下拉面板时闪现两个滚动条的问题

Author: Whbbit1999

packages/devui-vue/devui/virtual-list/src/virtual-list.tsx

@@ -235,15 +235,16 @@ export default defineComponent({
       syncScrollTop(newTop);
     };
 
+    const oldScrollTop = ref(0);
     const onComponentScroll = (e: UIEvent) => {
       const { scrollTop: newScrollTop } = e.currentTarget as Element;
       if (Math.abs(newScrollTop - state.scrollTop) >= 1) {
         syncScrollTop(newScrollTop);
       }
-
-      if (Math.abs(newScrollTop - state.scrollTop) !== 0) {
+      if (oldScrollTop.value) {
         barRef?.value?.onShowBar?.();
       }
+      oldScrollTop.value = newScrollTop;
       ctx.emit('scroll', e);
     };