From 074e82700ed176a4bdd30ce0e14e7e46cbc8902b Mon Sep 17 00:00:00 2001
From: Rainbow <1256734885@qq.com>
Date: Sat, 22 Nov 2025 15:54:29 +0800
Subject: [PATCH] fix(components): [select-v2] ResizeObserver loop completed
 with undelivered notifications (#22895)

fix: ResizeObserver loop completed with undelivered notifications
---
 packages/components/select-v2/src/useSelect.ts | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/packages/components/select-v2/src/useSelect.ts b/packages/components/select-v2/src/useSelect.ts
index 236eb55f93..0886a3e808 100644
--- a/packages/components/select-v2/src/useSelect.ts
+++ b/packages/components/select-v2/src/useSelect.ts
@@ -975,11 +975,24 @@ const useSelect = (props: SelectV2Props, emit: SelectV2EmitFn) => {
   })
   useResizeObserver(selectRef, handleResize)
   useResizeObserver(selectionRef, resetSelectionWidth)
-  useResizeObserver(menuRef, updateTooltip)
   useResizeObserver(wrapperRef, updateTooltip)
   useResizeObserver(tagMenuRef, updateTagTooltip)
   useResizeObserver(collapseItemRef, resetCollapseItemWidth)
 
+  // #21498
+  let stop: (() => void) | undefined
+  watch(
+    () => dropdownMenuVisible.value,
+    (newVal) => {
+      if (newVal) {
+        stop = useResizeObserver(menuRef, updateTooltip).stop
+      } else {
+        stop?.()
+        stop = undefined
+      }
+    }
+  )
+
   return {
     // data exports
     inputId,