[lazerg]

When createVaporSSRApp hydrates a component that changes state in onMounted, a v-for class binding keeps a stale class on the previous item. hydrateApp calls flushOnAppMount() inside withHydration(), so mounted hooks and the effects they trigger run while isHydrating is still true. The createSelector watcher then calls setClass on the old item, which only checks for a mismatch during hydration and never patches the DOM.

flushOnAppMount() now runs after withHydration() returns, so mounted hooks see a finished hydration, as they do on a regular mount.

close #15752

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	87.2 kB (+136 B)	30.6 kB (+145 B)	26.9 kB (+134 B)
runtime-dom.global.prod.js	117 kB (+2.29 kB)	43.9 kB (+885 B)	39.3 kB (+705 B)
vue.global.prod.js	177 kB (+2.35 kB)	64 kB (+996 B)	57 kB (+836 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	53.2 kB (+1.14 kB)	20.7 kB (+383 B)	18.9 kB (+404 B)
createApp	62 kB (+837 B)	23.9 kB (+272 B)	21.8 kB (+225 B)
createApp + vaporInteropPlugin	129 kB (+22.9 kB)	46.6 kB (+8 kB)	41.9 kB (+7.11 kB)
createVaporApp	34.1 kB (+5.36 kB)	13.1 kB (+1.96 kB)	12 kB (+1.78 kB)
createSSRApp	67 kB (+1 kB)	26 kB (+363 B)	23.6 kB (+355 B)
createVaporSSRApp	40.8 kB (+6.96 kB)	15.5 kB (+2.54 kB)	14.2 kB (+2.32 kB)
defineCustomElement	68.5 kB (+775 B)	25.9 kB (+220 B)	23.6 kB (+225 B)
defineVaporCustomElement	48.6 kB (+4.17 kB)	17.7 kB (+1.54 kB)	16.3 kB (+1.42 kB)
overall	77.5 kB (+1.3 kB)	29.5 kB (+402 B)	26.7 kB (+431 B)

[lazerg]

The continuous-release failure is a pkg.pr.new server error during publish (500, then 404). It is not caused by this change.