fix(hydration): properly handle optimized mode during hydrate node

[edison1105]

close #10607

• when the checkbox is clicked and the slot content is re-rendered, the STABLE flag is removed here:

  core/packages/runtime-core/src/componentSlots.ts

  Lines 219 to 221 in 3bf34b7

  	if (!optimized && type === SlotFlags.STABLE) {
  	delete slots._
  	}

  . this causing the processFragment to exit the optimized mode.
• the optimized value here is preserved in setupRenderEffect during the hydrate phase of mountComponent. However, the value of optimized should be true. because the patchFlag for slot content with the STABLE flag should be STABLE_FRAGMENT, and it should enter the optimized mode during patching.

function render(_ctx, _cache, $props, $setup, $data, $options) {
  return (_openBlock(), _createBlock($setup["TestComponent"], null, {
    default: _withCtx(() => [
      //....
    ]),
    _: 1 /* STABLE */
  }))
}

• there are no issues in the DEV environment because the code below corrects vnode.el.

core/packages/runtime-core/src/renderer.ts

Lines 1122 to 1125 in 3bf34b7

	if (__DEV__) {
	// necessary for HMR
	traverseStaticChildren(n1, n2)
	} else if (

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	90.6 kB (+25 B)	34.4 kB (+8 B)	31.1 kB (+52 B)
vue.global.prod.js	148 kB (+25 B)	53.7 kB (+10 B)	48 kB (+106 B)

Usages

Name	Size	Gzip	Brotli
createApp	50.8 kB	19.8 kB	18.1 kB
createSSRApp	54.1 kB (+25 B)	21.2 kB (+8 B)	19.3 kB (+3 B)
defineCustomElement	53.1 kB	20.6 kB	18.8 kB
overall	64.4 kB	24.9 kB	22.6 kB

[edison1105]

/ecosystem-ci run

[vue-bot]

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