fix(compiler): clone loc to ifNode

[KazariEX]

fix vuejs/language-tools#4911

The incremental update of language tools increased the start offset twice on the same loc object when traversing the v-if node.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB	38.1 kB	34.2 kB
vue.global.prod.js	160 kB (+40 B)	58 kB (+20 B)	51.6 kB (+51 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49.1 kB	18.9 kB	17.3 kB
createApp	55.7 kB	21.4 kB	19.6 kB
createSSRApp	59.7 kB	23.1 kB	21 kB
defineCustomElement	60.4 kB	23 kB	20.9 kB
overall	69.4 kB	26.5 kB	24.1 kB

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commit: 683ef82

[edison1105]

Hi @KazariEX,

I reviewed this PR and I'm not entirely clear on the changes. Could you please provide a brief explanation of why these changes were necessary?

Thank you!

[KazariEX]

ifNode and branch.children[0] share the same loc object, which means that the start offset of this loc will be increased one more time.

This explains why the semantic tokens in the issue have been moved one extra digit to the right.

https://github.com/vuejs/language-tools/blob/6916e42fb7109d9510e181de24f1a0f3d56da63b/packages/language-core/lib/plugins/vue-template-html.ts#L142-L146

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	❌ failure	❌ failure
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