Fix: change the timing for clearing the inlined data buffer

[huozhi]

Fix error of Unexpected server data: missing bootstrap script when the initial rendering is streaming rsc.

Introduced in #35344, the buffer might still keep flushing after on mount.

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	shuding/next.js shu/0612	Change
buildDuration	15.8s	15.8s	⚠️ +45ms
buildDurationCached	6.2s	6.3s	⚠️ +98ms
nodeModulesSize	456 MB	456 MB	⚠️ +1.73 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	shuding/next.js shu/0612	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.128	3.194	⚠️ +0.07
/ avg req/sec	799.17	782.8	⚠️ -16.37
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.349	1.404	⚠️ +0.05
/error-in-render avg req/sec	1852.98	1780.46	⚠️ -72.52

Client Bundles (main, webpack)

	vercel/next.js canary	shuding/next.js shu/0612	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28 kB	28 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.6 kB	71.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	shuding/next.js shu/0612	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	shuding/next.js shu/0612	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	192 B	192 B	✓
amp-HASH.js gzip	309 B	309 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.48 kB	5.48 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	319 B	319 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.2 kB	15.2 kB	✓

Client Build Manifests

	vercel/next.js canary	shuding/next.js shu/0612	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	shuding/next.js shu/0612	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

Diffs

Diff for main-HASH.js

@@ -1312,6 +1312,9 @@
         var ServerRoot,
           rscCache,
           nextServerDataLoadingGlobal,
+          DOMContentLoaded,
+          initialServerDataFlushed,
+          initialServerDataLoaded,
           initialServerDataWriter,
           initialServerDataBuffer,
           encoder,

Diff for index.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-fb3e61118240274c.js"
+      src="/_next/static/chunks/main-f0211c30f9415997.js"
       defer=""
     ></script>
     <script

Diff for link.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-fb3e61118240274c.js"
+      src="/_next/static/chunks/main-f0211c30f9415997.js"
       defer=""
     ></script>
     <script

Diff for withRouter.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-fb3e61118240274c.js"
+      src="/_next/static/chunks/main-f0211c30f9415997.js"
       defer=""
     ></script>
     <script

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	shuding/next.js shu/0612	Change
buildDuration	19.2s	19.8s	⚠️ +563ms
buildDurationCached	6.1s	6.2s	⚠️ +87ms
nodeModulesSize	456 MB	456 MB	⚠️ +1.73 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	shuding/next.js shu/0612	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.171	3.178	⚠️ +0.01
/ avg req/sec	788.31	786.66	⚠️ -1.65
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.351	1.356	⚠️ +0.01
/error-in-render avg req/sec	1850.25	1844.08	⚠️ -6.17

Client Bundles (main, webpack)

	vercel/next.js canary	shuding/next.js shu/0612	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.2 kB	28.2 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	shuding/next.js shu/0612	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	shuding/next.js shu/0612	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	313 B	313 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.59 kB	5.59 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.33 kB	2.33 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	388 B	388 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.3 kB	15.3 kB	✓

Client Build Manifests

	vercel/next.js canary	shuding/next.js shu/0612	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	shuding/next.js shu/0612	Change
index.html gzip	531 B	531 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Diffs

Diff for main-HASH.js

@@ -1312,6 +1312,9 @@
         var ServerRoot,
           rscCache,
           nextServerDataLoadingGlobal,
+          DOMContentLoaded,
+          initialServerDataFlushed,
+          initialServerDataLoaded,
           initialServerDataWriter,
           initialServerDataBuffer,
           encoder,

Diff for index.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-fb3e61118240274c.js"
+      src="/_next/static/chunks/main-f0211c30f9415997.js"
       defer=""
     ></script>
     <script

Diff for link.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-fb3e61118240274c.js"
+      src="/_next/static/chunks/main-f0211c30f9415997.js"
       defer=""
     ></script>
     <script

Diff for withRouter.html

@@ -19,7 +19,7 @@
       defer=""
     ></script>
     <script
-      src="/_next/static/chunks/main-fb3e61118240274c.js"
+      src="/_next/static/chunks/main-f0211c30f9415997.js"
       defer=""
     ></script>
     <script

Commit: bff1880