fix(components): [affix] positioning under KeepAlive cache (#23549)

* fix(components): [affix] positioning under KeepAlive cache

* Update packages/components/affix/src/affix.vue

Co-authored-by: rzzf <cszhjh@gmail.com>

---------

Co-authored-by: rzzf <cszhjh@gmail.com>

packages/components/affix/src/affix.vue

@@ -12,6 +12,8 @@
 import {
   computed,
   nextTick,
+  onActivated,
+  onDeactivated,
   onMounted,
   ref,
   shallowRef,
@@ -158,6 +160,14 @@ onMounted(() => {
   updateRoot()
 })
 
+onActivated(() => {
+  nextTick(updateRootRect)
+})
+
+onDeactivated(() => {
+  fixed.value = false
+})
+
 useEventListener(scrollContainer, 'scroll', handleScroll)
 watchEffect(update)