fix(Transition): handle leave immediately done in out-in mode

[edison1105]

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This is an edge case. It occurs because done is executed immediately in onLeave, causing afterLeave to execute immediately, while emptyPlaceholder hasn't yet been mounted.

While reviewing #4941, I found that #4933 could no longer be reproduced, so I closed them. However, the second issue described in #11061 was previously marked as a duplicate of #4941. #4933 does indeed fix it, but the test cases are not the same. Therefore, I created this new PR.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+2 B)	38 kB (+2 B)	34.2 kB (+18 B)
vue.global.prod.js	159 kB (+2 B)	57.9 kB (+2 B)	51.5 kB (+15 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
createSSRApp	59 kB	23 kB	20.9 kB
defineCustomElement	59.8 kB	22.8 kB	20.8 kB
overall	68.7 kB (+2 B)	26.3 kB (+1 B)	24 kB (+4 B)

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commit: 43d5e4d

[yyx990803]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

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