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[fragment-scroll] Rename ScrollAndMaybeFocusHandler to ScrollHandler - #96828

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[fragment-scroll] Rename ScrollAndMaybeFocusHandler to ScrollHandler#96828
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@eps1lon

@eps1lon eps1lon commented Aug 6, 2026

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As of #95602, the old scroll-and-focus handler doesn't exist anymore
As of #96113, the new handler no longer handles focus.

This updates the relevant variable names to reflect that we no longer handle focus.

The handler in `layout-router.tsx` no longer touches focus or blur. Focusing the
first host descendant was removed in #89903 and blurring on navigation was
removed in #96113, so the "MaybeFocus" part of the name has described nothing for
a while. This change renames `ScrollAndMaybeFocusHandler` to `ScrollHandler`,
`InnerScrollAndMaybeFocusHandler` to `InnerScrollHandler`, and
`ScrollAndMaybeFocusHandlerProps` to `ScrollHandlerProps`.

The ref the handler reads is renamed along with it. The `FocusAndScrollRef` type
becomes `ScrollHandlerRef`, and the `focusAndScrollRef` field becomes `scrollRef`
on `AppRouterState`, on `GlobalLayoutRouterContext`, and on the handler's own
props. `InnerScrollHandler` aliases that prop to `scrollHandlerRef` when it
destructures, because the effect already binds a local `scrollRef` for the
resolved `ScrollRef` whose `current` it writes. The type itself cannot simply be
called `ScrollRef`, since `router-reducer-types.ts` already imports that name
from `app-router-types.ts` and uses it inside the definition.

Two stale comments are corrected as well. `navigation.ts` referred to a
`ScrollAndFocusHandler` that has not existed for some time, and the doc comment
on `AppRouterState` still claimed the field drives focus management.

This is a pure rename with no behavior change. The component names are also
updated in `nextjsClientComponentNames` in `test/lib/next-test-utils.ts` and in
the owner-stack snapshot in `test/development/browser-logs/browser-logs.test.ts`.
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Stats from current PR

✅ No significant changes detected

📊 All Metrics
📖 Metrics Glossary

Dev Server Metrics:

  • Listen = TCP port starts accepting connections
  • First Request = HTTP server returns successful response
  • Cold = Fresh build (no cache)
  • Warm = With cached build artifacts

Build Metrics:

  • Fresh = Clean build (no .next directory)
  • Cached = With existing .next directory

Change Thresholds:

  • Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
  • Size: Changes < 1KB AND < 1% are insignificant
  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 812ms 812ms ▁█▁▁▁
Cold (Ready in log) 778ms 778ms ▁█▁▁▂
Cold (First Request) 1.274s 1.273s ▂█▂▁▃
Warm (Listen) 812ms 813ms ▂█▂▂▂
Warm (Ready in log) 773ms 789ms ▁█▁▁▂
Warm (First Request) 1.263s 1.286s ▅▁▅▄▅
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 813ms 812ms █████
Cold (Ready in log) 790ms 781ms ▄█▆▃▄
Cold (First Request) 3.436s 3.341s ▄█▆▂▂
Warm (Listen) 814ms 813ms █████
Warm (Ready in log) 788ms 787ms ▅█▅▃▃
Warm (First Request) 3.415s 3.386s ▄█▆▂▂

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.972s 5.703s ▂█▁▁▃
Cached Build 2.966s 2.919s ▂█▂▁▃
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.683s 24.423s ▅█▆▅▃
Cached Build 24.675s 24.558s ▅█▄▃▂
node_modules Size 552 MB 552 MB ▁▁███
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📝 Changed Files (8 files)

Files with changes:

  • app-page-exp..ntime.dev.js
  • app-page-exp..time.prod.js
  • app-page-tur..ntime.dev.js
  • app-page-tur..time.prod.js
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  • app-page.runtime.prod.js
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/7e1ae3b622ef4ea547ffafc1d91b7e3001fbc45f/next

Commit: 7e1ae3b

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Tests Passed

Commit: 7e1ae3b

@eps1lon
eps1lon changed the base branch from sebbie/force-new-scroll-handler to canary August 6, 2026 14:17
@eps1lon
eps1lon marked this pull request as ready for review August 7, 2026 14:30
@eps1lon
eps1lon requested a review from icyJoseph August 7, 2026 14:30
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