fix(runtime-core): handle prop starts with on, but is not an event handler

[edison1105]

close #7871
This is an edge case where the user uses on-xxx as a prop not an eventHandler, and mergeProps treats it as an event listener. This PR modifies the merging logic only to treat it as an event listener if the prop's value is a function.

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result
naive-ui	❌ failure
nuxt	✅ success
pinia	✅ success
router	✅ success
test-utils	✅ success
vant	✅ success
vite-plugin-vue	✅ success
vitepress	✅ success
vue-macros	✅ success
vuetify	✅ success
vueuse	✅ success

[skirtles-code]

I think there are some similar special cases that might also be worth considering:

Playground

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result
naive-ui	❌ failure
nuxt	❌ failure
pinia	✅ success
router	✅ success
test-utils	✅ success
vant	✅ success
vite-plugin-vue	✅ success
vitepress	✅ success
vue-macros	✅ success
vuetify	✅ success
vueuse	✅ success

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+44 B)	38 kB (+26 B)	34.2 kB (+17 B)
vue.global.prod.js	159 kB (+44 B)	57.9 kB (+25 B)	51.4 kB (+8 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47 kB (+44 B)	18.3 kB (+18 B)	16.7 kB (+20 B)
createApp	55 kB (+44 B)	21.3 kB (+19 B)	19.4 kB (+30 B)
createSSRApp	59 kB (+44 B)	23 kB (+20 B)	20.9 kB (+5 B)
defineCustomElement	59.8 kB (+44 B)	22.9 kB (+27 B)	20.8 kB (-45 B)
overall	68.7 kB (+44 B)	26.4 kB (+19 B)	24 kB (+2 B)

[skirtles-code]

I think there's a problem here with merging arrays of listeners. e.g.:

• Playground

Listener c gets discarded because the incoming value is an array.

[edison1105]

/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	✅ success	✅ 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

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@vue/server-renderer

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@vue/shared

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vue

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commit: fa4379e