fix(components): [select] ensure scrollbar syncs when scrolling to selected option (#19636)

* fix: ensure scrollbar syncs when scrolling to selected option

* feat: update scrollbar when drop-down menu is displayed

packages/components/select/src/useSelect.ts

@@ -708,7 +708,10 @@ export const useSelect: useSelectType = (props: ISelectProps, emit) => {
 
   const handleMenuEnter = () => {
     states.isBeforeHide = false
-    nextTick(() => scrollToOption(states.selected))
+    nextTick(() => {
+      scrollbarRef.value?.update()
+      scrollToOption(states.selected)
+    })
   }
 
   const focus = () => {