fix(watch): update oldValue before running cb to prevent stale value

[jh-leong]

close #12294

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38 kB (-1 B)	34.2 kB (+6 B)
vue.global.prod.js	159 kB	57.9 kB	51.4 kB (-12 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.9 kB	18.3 kB	16.7 kB
createApp	55 kB	21.3 kB	19.4 kB (+14 B)
createSSRApp	59 kB	23 kB (-1 B)	20.9 kB (-10 B)
defineCustomElement	59.8 kB	22.8 kB (-1 B)	20.8 kB (-63 B)
overall	68.7 kB	26.3 kB	23.9 kB (-49 B)

[pkg-pr-new]

Open in Stackblitz

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@12296

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@12296

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@12296

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@12296

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@12296

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@12296

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@12296

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@12296

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@12296

vue

pnpm add https://pkg.pr.new/vue@12296

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@12296

commit: 9f5eb0c

[jh-leong]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	✅ success	✅ success
nuxt	✅ success	✅ success
pinia	✅ success	✅ success
primevue	✅ success	✅ success
quasar	✅ success	✅ success
radix-vue	✅ success	✅ success
router	✅ success	✅ success
test-utils	✅ success	✅ success
vant	❌ failure	✅ success
vite-plugin-vue	✅ success	✅ success
vitepress	✅ success	✅ success
vue-i18n	✅ success	✅ success
vue-macros	✅ success	✅ success
vuetify	✅ success	✅ success
vueuse	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success

[jh-leong]

/ecosystem-ci run vant

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
vant	✅ success	✅ success