Add a browser-style base keymap preset

[teamleaderleo]

Problem

cmux is already close to a browser on the keyboard. Cmd+T opens a surface, Cmd+W closes a tab, Cmd+Shift+T reopens a closed browser panel, Cmd+L focuses the address bar, Cmd+R reloads, Cmd+F finds, and Cmd+[ / Cmd+] go back and forward.

Two things are off, and one of them is not what you would guess:

• Cmd+1..9 is on the wrong thing. In cmux, Cmd+1..9 selects a workspace and Select Surface sits on Ctrl+1..9, where it also overlaps the right sidebar's Ctrl+1..6. In a browser, Cmd+1..9 picks a tab.
• Ctrl+Tab works, but only by accident. It does cycle surfaces today, through a hardcoded legacy handler in AppDelegate that no action owns (matchesLegacyNextSurfaceShortcut, dispatched next to the configured .nextSurface in the same handleCustomShortcut). Because no action owns it, it does not appear in Settings, it does not appear in the View menu, and you cannot rebind it. It also does not fire with Caps Lock on: the legacy matcher compares raw deviceIndependentFlagsMask flags, while a configured stroke goes through normalizedModifierFlags, which subtracts Caps Lock, numeric pad and function.

So the gap for Tab cycling is not that the keys do nothing. It is that they are invisible, unchangeable, and subtly broken.

Resulting behavior

A fifth base keymap preset, Browser-style (Ctrl-Tab), in Settings > Keyboard Shortcuts > Base Keymap and in the Command Palette as "Base Keymap: Browser-style (Ctrl-Tab)". It writes four overrides and nothing else:

Action	cmux default	Browser-style
Next Surface	⌘⇧]	⌃Tab
Previous Surface	⌘⇧[	⌃⇧Tab
Select Surface 1…9	⌃1…9	⌘1…9
Select Workspace 1…9	⌘1…9	⌥⌘1…9

The number row is the behavioral change. The Tab rows change what you can do with the keys rather than what they do: after applying, Ctrl+Tab shows up as Next Surface in Settings and in the View menu, you can rebind it there, and it survives Caps Lock.

Workspaces move to the Option row for the same reason the iTerm2 preset moves them: Cmd+1..9 now belongs to the tab bar. Everything else a browser user reaches for is already a cmux default, so the preset leaves it alone. A test pins that list, and fails if one of those defaults drifts.

An action carries one binding, so Cmd+Shift+[ and Cmd+Shift+] end up unbound. That is a straight cost, not a swap, and the preview says so before anything is written:

⌃Tab and ⌃⇧Tab already cycle tabs. Binding them here makes them visible and rebindable in Settings and works with Caps Lock on; ⌘⇧[ and ⌘⇧] go unbound in the trade. ⌘T, ⌘W, ⌘L, ⌘R, ⌘F and ⌘[ / ⌘] already match a browser and are left alone, as does ⌘⇧T, which reopens a closed browser panel.

The number-row warning that iTerm2 already showed now shows for this preset too, since both write the identical selectSurfaceByNumber / selectWorkspaceByNumber pair:

⌘1…9 will select tabs in the focused pane instead of workspaces. Workspaces move to ⌥⌘1…9.

Nothing changes for anyone who does not pick the preset. The default keymap is untouched.

Notes

• Built on Add base keymap presets for keyboard shortcuts #15003, so it inherits the whole machinery: the confirm-before-write preview, the line-by-line before/after diff, keeping bindings you set by hand, and the macOS conflict warnings. The four @Test(arguments: ShortcutKeymapPreset.allCases) suites cover the new case automatically, and they confirm it introduces no cmux binding collisions and no macOS shortcut collisions.
• Browser and iTerm2 write the same two numbered actions, which is the one place preset detection could get confused. It does not: active(in:) also requires the preset's own plan to be empty, and that check catches required removals as well as additions, so a browser file fails iTerm2's check and vice versa. A new test pins both directions and the full iTerm2 → browser → iTerm2 round trip.
• Ctrl+Tab is safe to claim in a terminal, and this PR is not the thing that claims it. Tab is Ctrl+I, Ctrl+Tab has no standard terminal sequence, and the legacy handler has been taking it app-wide already.
• parseConfigKeyToken already accepts tab, so "ctrl+tab" is a hand-editable cmux.json value like any other.
• Base Keymap is now findable in Settings search by "browser", "chrome", "safari", "firefox" or "ctrl-tab". Palette keywords are per preset now, so searching "chrome" stops surfacing the tmux entry.

Part of the browser-native hotkeys work. The first-run keymap chooser follows in #15251.

Changelog

Added: A Browser-style base keymap preset in Settings > Keyboard Shortcuts > Base Keymap: Ctrl-Tab and Ctrl-Shift-Tab cycle surfaces and Cmd-1...9 selects one, with workspaces moving to Cmd-Opt-1...9.

Fixed: Ctrl-Tab and Ctrl-Shift-Tab now appear in Settings and the View menu and can be rebound, and they work with Caps Lock on, for anyone on the Browser-style base keymap.

Verification

python3 scripts/verify-local.py selected and passed all 5 affected checks: Swift syntax, XCStrings structure, localization parity, workspace package groups, and feature flag policy. Native compilation and app tests were not run locally; CI owns those, and full-ci is on so the Release build compiles.

Localization audit: 2 new keys (shortcut.keymap.preset.browser, shortcut.keymap.summary.browserTabs) plus a reworded settings.search.alias.setting.keyboardShortcuts.base-keymap, all in Resources/Localizable.xcstrings next to the other shortcut.keymap.* keys and translated into all 9 macOS locales. python3 scripts/localization_catalog.py check reports 0 parity errors and scripts/lint-xcstrings.py passes. No web message keys changed.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added a browser-style keyboard shortcut preset. Ctrl-Tab and Ctrl-Shift-Tab switch surfaces; Cmd-1 through Cmd-9 select surfaces; and Cmd-Option-1 through Cmd-Option-9 select workspaces.
  • Ctrl-Tab can be rebound in the preset, and its shortcut works with Caps Lock. Cmd-Shift-[ and Cmd-Shift-] are unbound.
  • Browser preset names and aliases—including Chrome, Safari, and Firefox—are searchable in keyboard shortcut settings.
• Documentation
  • Added guidance on the browser-style keymap and its shortcut bindings.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between e4edeab and fea3c1c.

📒 Files selected for processing (10)

• Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutKeymapPreset.swift
• Packages/macOS/CmuxSettings/Tests/CmuxSettingsTests/ShortcutKeymapPresetTests.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+Default.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/ShortcutKeymapPresetText.swift
• Resources/Localizable.xcstrings
• Sources/ContentView+KeymapPresetCommands.swift
• Sources/SettingsSearchAliases.swift
• Sources/SettingsSearchIndex.swift
• scripts/localization-allowed-omissions.json
• skills/cmux-keyboard-shortcuts/SKILL.md

📝 Walkthrough

Walkthrough

The change adds a browser-style keymap preset with surface-cycling and numbered surface and workspace shortcuts. It also adds preset-specific display text, search terms, tests, and documentation.

Changes

Browser-style keymap

Layer / File(s)	Summary
Preset bindings and validation Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutKeymapPreset.swift, Packages/macOS/CmuxSettings/Tests/CmuxSettingsTests/ShortcutKeymapPresetTests.swift	Adds browser-style bindings for surface cycling and numbered surface and workspace selection. Tests cover unchanged defaults, preset detection, and switching between browser and iTerm2 presets.
Preset name and shortcut notes Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/ShortcutKeymapPresetText.swift	Adds the browser preset display name and shortcut notes. The number-row warning now also applies to the browser preset.
Preset search and documentation Sources/ContentView+KeymapPresetCommands.swift, Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+Default.swift, Sources/SettingsSearchAliases.swift, Sources/SettingsSearchIndex.swift, skills/cmux-keyboard-shortcuts/SKILL.md	Adds preset-specific command keywords and browser-related search terms. Updates the keyboard shortcut documentation with the browser-style preset and its bindings.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Suggested reviewers: austinywang

Security Architecture Review

Security architecture risk: 🔵 Low · up to a101a

The change is confined to local keyboard settings and does not demonstrate increased access or privileges. A low-risk ownership issue remains: manually configured Ctrl-Tab bindings can become eligible for removal when another preset is applied. Preview and explicit confirmation limit the impact.

Retained concerns

• Low · architecture · inferred: Adding browser to allCases broadens value-based preset ownership. Existing manually configured Ctrl-Tab or Ctrl-Shift-Tab surface bindings can now be treated as preset-owned and removed when applying cmux or another preset, without first applying browser. Explicit preview and Apply mitigate the impact, but do not distinguish user-authored values from preset-authored values.

Security review details

Security Blast Radius

• inferred — The examined mutation scope is the local shortcuts.bindings configuration and resulting selection behavior. No expansion to tenant, remote-service, credential, or infrastructure authority was demonstrated by these paths.

Trust Boundaries and Controls

• observed — Search discovery does not itself write settings. The palette handler proposes a preset, and the settings row retains an explicit preview-and-Apply boundary with cancellation before persistence.

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (2 errors, 1 warning)

Check name	Status	Explanation	Resolution
Cmux Full Internationalization	❌ Error	The PR adds two user-facing localized Swift strings in ShortcutKeymapPresetText.swift: shortcut.keymap.preset.browser and shortcut.keymap.summary.browserTabs. Both have catalog values only for `…	Add non-placeholder translated stringUnit entries for bs, da, it, km, nb, pl, pt-BR, ru, th, tr, and uk to shortcut.keymap.preset.browser and shortcut.keymap.summary.browserTabs. Update the changed `settings.sear…
Cmux Architecture Rethink	❌ Error	The browser preset creates a second owner for surface cycling. The diff maps .nextSurface and .prevSurface to ctrl+tab and ctrl+shift+tab, but it does not change the existing hardcoded legacy …	Centralize the legacy Ctrl-Tab compatibility behavior in the configured shortcut/action resolver. Remove the direct matchesLegacyNextSurfaceShortcut and matchesLegacyPreviousSurfaceShortcut dispatch branches, or make them a resolver-own…
Docstring Coverage	⚠️ Warning	Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 7 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (22 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise, clear, and accurately describes the primary change: adding a browser-style base keymap preset.
Description check	✅ Passed	The description clearly explains the problem, resulting behavior, implementation scope, tests added, verification performed, localization audit, and changelog entries. It is mostly complete, but it om…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Cmux Cloud Persistent Session And Early Input	✅ Passed	PASS: The pull request changes only the keyboard preset, related tests, UI text, search aliases, localization, and documentation. The reviewed diff contains no Cloud terminal creation, cmux-tui transp…
Cmux Swift Actor Isolation	✅ Passed	PASS: The production diff adds a browser case and pure value-based override logic to the existing ShortcutKeymapPreset: Sendable enum. The CmuxSettings and CmuxSettingsUI Swift 6 package manif…
Cmux Swift Blocking Runtime	✅ Passed	No blocking-runtime primitive is introduced or expanded. The production Swift diff only adds browser preset data, display text, and search keywords. The added test helper only replays deterministic pl…
Cmux Browser Automation Off-Main	✅ Passed	The check is not applicable to this PR. The reviewed diff changes keymap presets, search aliases, localization, tests, and documentation. Sources/TerminalController.swift, `ControlCommandExecutionPo…
Cmux Expensive Synchronous Load	✅ Passed	PASS. The PR changes only keymap preset data, UI text/search aliases, command-palette keywords, localization, documentation, and tests. The added production Swift lines contain no agent-history loader…
Cmux Cache Substitution Correctness	✅ Passed	PASS. The production diff adds a browser keymap enum case, static shortcut overrides, display text, search keywords, and command-palette keywords. It does not replace an authoritative read with a cach…
Cmux No Hacky Sleeps	✅ Passed	PASS: The pull request changes only Swift, localization data, and Markdown. It adds no TypeScript, JavaScript, shell, or build/runtime script changes. Therefore the non-Swift hacky-sleep check does no…
Cmux Algorithmic Complexity	✅ Passed	The PR adds one enum case, four fixed shortcut overrides, five preset keyword lists, and bounded summary checks. The affected preset paths iterate only static ShortcutKeymapPreset.allCases and `Shor…
Cmux Swift Concurrency	✅ Passed	The reviewed Swift diff adds a browser keymap preset, preset tests, UI text, and search keywords. It introduces no background Dispatch queues, Combine app state, completion-handler API, or fire-and-fo…
Cmux Swift @Concurrent	✅ Passed	The PR adds a synchronous ShortcutKeymapPreset.browser case, synchronous override and search helpers, and synchronous tests. The authoritative Swift diff contains no added or modified async, `noni…
Cmux Swift Package Boundaries	✅ Passed	PASS. The new keymap domain model remains behind the existing CmuxSettings SwiftPM target: ShortcutKeymapPreset.browser is added under Packages/macOS/CmuxSettings/Sources, and its independent te…
Cmux Swiftpm Lockfiles	✅ Passed	The PR changes only Swift source/tests, localization, and documentation. The authoritative diff contains no Package.swift, Package.resolved, .gitignore, workflow, Xcode project, or workspace package-r…
Cmux Swift Logging	✅ Passed	The PR adds no production logging. The changed Swift lines define keymap data, UI text, palette keywords, and tests. The added-line scan found no print, debugPrint, dump, NSLog, Logger, file…
Cmux User-Facing Error Privacy	✅ Passed	The diff adds a browser-style keymap preset and related Settings UI preview, labels, search metadata, tests, and documentation. The changed preview contains only shortcut and cmux/product behavior ter…
Cmux Swiftui State Layout	✅ Passed	PASS. The PR adds a keymap enum case, preset tests, search terms, command-palette keywords, and display text. It does not add or materially expand SwiftUI state, GeometryReader measurement, lazy/list …
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	The pull request changes keymap presets, tests, search metadata, localization, and documentation. The Swift diff adds no NSWindow, NSPanel, NSWindowController, SwiftUI Window/WindowGroup, window ident…
Cmux Source Artifacts	✅ Passed	All nine changed paths are intentional Swift source/tests, documentation, or the tracked localization catalog. The authoritative diff contains no artifact directories or paths for logs, screenshots, r…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	The reviewed production Swift changes add the .browser preset, display/search text, and preset-specific command keywords. The diff adds no #if DEBUG or other test-build guard, no debug…/`…ForTes…

Full details: Docstring Coverage

Explanation

Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 7 files. (1 skipped: 1 unsupported.)

Full details: Cmux Full Internationalization

Explanation

The PR adds two user-facing localized Swift strings in ShortcutKeymapPresetText.swift: shortcut.keymap.preset.browser and shortcut.keymap.summary.browserTabs. Both have catalog values only for ar, de, en, es, fr, ja, ko, zh-Hans, and zh-Hant. Resources/Localizable.xcstrings already supports bs, da, it, km, nb, pl, pt-BR, ru, th, tr, and uk, so the new entries lack translations for those locales. The PR also materially changes the catalog key settings.search.alias.setting.keyboardShortcuts.base-keymap but retains the same incomplete locale coverage. The Swift call sites use the required localized API, but the catalog does not meet the all-supported-locales requirement.

Resolution

Add non-placeholder translated stringUnit entries for bs, da, it, km, nb, pl, pt-BR, ru, th, tr, and uk to shortcut.keymap.preset.browser and shortcut.keymap.summary.browserTabs. Update the changed settings.search.alias.setting.keyboardShortcuts.base-keymap entry for those locales as well, or do not materially change that catalog key.

Full details: Cmux Architecture Rethink

Explanation

The browser preset creates a second owner for surface cycling. The diff maps .nextSurface and .prevSurface to ctrl+tab and ctrl+shift+tab, but it does not change the existing hardcoded legacy branches in Sources/AppDelegate.swift. The configured route runs first at handleAdjacentNavigationShortcut, while the legacy route still matches the same physical strokes later at lines 16210–16230. After a user rebinds the action, the legacy route still owns Ctrl-Tab, so the shortcut is not fully rebindable. The two paths also use different modifier matching: Sources/App/ShortcutRoutingSupport.swift compares raw flags, while configured matching normalizes Caps Lock. This materially expands existing duplicate entrypoint wiring and leaves shortcut ownership state representable. The configured shortcut action should be the single source of truth for surface cycling.

Resolution

Centralize the legacy Ctrl-Tab compatibility behavior in the configured shortcut/action resolver. Remove the direct matchesLegacyNextSurfaceShortcut and matchesLegacyPreviousSurfaceShortcut dispatch branches, or make them a resolver-owned compatibility alias that is active only when the action has no user or preset binding. Ensure a configured binding suppresses the legacy alias. Route both default compatibility strokes and preset strokes through the same action path and normalized modifier matching. Add tests that verify browser preset selection, rebinding .nextSurface/.prevSurface, and Caps Lock behavior so the old strokes cannot remain active after a rebind.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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CI failure attribution

CI stopped on 3ed76f5883 (run 36697151619 attempt 1): 1 code.

Job	Verdict	Why
macos / app-host unit tests (6/7)	code	a test failed

Matched log lines

macos / app-host unit tests (6/7): ✘ Test "Receipt, older snapshot, and accepted graph retain one native terminal and its first input" recorded an issue at CloudWorkspaceCreationSidebarTests.swift:93:6: Time limit was exceeded: 300.000 seconds

Not re-run automatically: macos / app-host unit tests (6/7) is not a machine failure.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's.

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[teamleaderleo]

Review

A review subagent went through this at d04ee318c76. It found no crash, no data loss and nothing that would fail CI, and it independently verified the parts I was least sure about: that "ctrl+tab" parses, passes binding policy and dispatches by key code 48 through the generic matcher; that usesNumberedDigitMatching expands 1…9 for both numbered actions and is modifier-agnostic, so cmd+opt+1 covers ⌥⌘1…9; and that browser and iTerm2 cannot be mistaken for each other by active(in:) in either direction.

Then it found that the PR's headline justification was false. It was right, I checked the code myself, and that is the substance of the follow-up commit.

Fixed

Ctrl+Tab was never missing. matchesLegacyNextSurfaceShortcut in Sources/AppDelegate+DockShortcutRouting.swift:348 builds exactly the two strokes this preset binds, and Sources/AppDelegate.swift:16131 dispatches them to selectNextSurface() / selectPreviousSurface() from inside the same handleCustomShortcut that handles the configured action. No flag, no gate. So "There is no Ctrl+Tab / Ctrl+Shift+Tab" was wrong in the PR body, in the case browser doc comment, in the commit message, in the skill doc, and in the note shown to users before they apply.

The preset still earns its keep, and now says why: binding the stroke to an action is what makes it visible in Settings and the View menu and rebindable, where the legacy handler is neither, and it fixes Caps Lock, because matchesTab compares raw deviceIndependentFlagsMask flags while a configured stroke goes through normalizedModifierFlags, which subtracts .capsLock. The review deserves credit for finding that second one; I would not have looked.

The ⌘⇧[ / ⌘⇧] loss is now stated as a cost, not a trade. They become unbound with nothing taking their place. Every version of the text said "stop cycling them", which reads like an exchange.

Browser now gets the number-row warning. Both presets write the identical selectSurfaceByNumber / selectWorkspaceByNumber pair and only iTerm2 explained it. The gate also had a second hole the review caught: the browser note was conditioned on nextSurface appearing in changes, so a user who had rebound that action by hand landed it in kept and got no prose warning at all while ⌘1…9 still moved off workspaces. The number-row sentence is now gated on the number-row change itself, independently.

Base Keymap was unfindable by searching for "browser". Three Settings-search keyword lists enumerate presets and stopped at tmux (Sources/SettingsSearchIndex.swift:203, Sources/SettingsSearchAliases.swift:212, CuratedSettingEntry+Default.swift:497). All three updated, including the alias's 9 locale values.

Palette keywords were shared across all five presets, so "chrome" surfaced the tmux entry and "tmux" surfaced the browser one. Pre-existing, but this PR added five brand tokens to it. Now per preset.

The ⌘⇧T claim was too broad. It maps to reopenClosedBrowserPanel, which reopens a closed browser panel, not any closed tab the way a browser does. The preview note says which. It also now lists ⌘R and ⌘F, which the doc comment claimed and the user-facing text omitted.

Added the round trip that actually risks ambiguity. The existing test went browser → cmux. Browser and iTerm2 are the pair that share bindings, so there is now a test for detection in both directions plus a full iTerm2 → browser → iTerm2 round trip that asserts the final override set each way.

Left

A hand-typed "nextSurface": "ctrl+tab" is now reclaimed by preset detection. isPresetValue treats a value equal to any preset's value for that action as preset-owned, so switching to cmux deletes it. This is the documented stateless-detection tradeoff from #15003, with its own test, and the review flagged it only because the legacy handler makes ctrl+tab an unusually likely thing to have typed by hand. Changing it means giving presets provenance tracking, which is a bigger design question than this PR; noted for the multi-binding follow-up.

Menu key-equivalent ordering for Tab was raised as plausible but unverifiable without a build. AppKit matches menu equivalents in sendEvent ahead of the responder chain, while cmux routes through a local key monitor. Whichever wins, both paths call selectNextSurface(), so the risk is cosmetic. This is exactly the kind of thing the fleet dogfood run will show.

Verification: python3 scripts/verify-local.py 5/5, localization_catalog.py check 0 parity errors, lint-xcstrings.py passes. full-ci is on, so the Release build compiles.

[vercel]

Deployment failed for project cmux with the following error:

The provided GitHub repository does not contain the requested branch or commit reference. Please ensure the repository is not empty.

[teamleaderleo]

Caught up with main; new head ab8977c3e18.

The branch had gone conflicting on Resources/Localizable.xcstrings, so no checks were running at all. Resolved with scripts/merge-main.sh, which merged b7ff00616a7 (the newest main with green guards; it skipped the pending tip 2e0750be50a) and took the key-level union on the catalog.

The catalog diff looks enormous because the union moved a block of keys, shifting every line after it. The content is minimal, and I checked it key by key against that main rather than reading the diff: 0 keys lost from either side, exactly 2 added (shortcut.keymap.preset.browser, shortcut.keymap.summary.browserTabs), and exactly 1 changed (settings.search.alias.setting.keyboardShortcuts.base-keymap, which this PR rewrites on purpose to add the browser tokens). Key order ends up 12 inversions away from main's across 7,171 shared keys, so it should not fight the next catch-up.

Scoped verification is 5/5 and scripts/lint-ios-package-conventions.sh is clean on the new head. The dogfood request has been repointed at ab8977c3e18.

[teamleaderleo]

CI caught a test of mine that never compiled. Worth writing down, because the way it hid is reusable.

iTerm2RoundTripsThroughBrowser did bindings[change.action] = change.write, where bindings is [ShortcutAction: StoredShortcut] and ShortcutKeymapChange.write is ShortcutKeymapBinding?. Those are deliberately different types: a plan writes the hand-editable "cmd+d" / ["ctrl+b", "c"] form so cmux.json stays readable, and bindings compare as parsed StoredShortcut. So CmuxSettingsTests did not build and the round trip never ran.

It hid because the branch went conflicting with main, and GitHub runs no checks at all on a conflicting PR. The catch-up merge was the first run that got as far as compiling the test target, which is also why this shows up as "new" on a commit that did not touch the test.

Fixed in bd4e21d8928: each write is parsed through ShortcutKeymapBinding.shortcut, the same way the suite's own applied(_:) helper does, in a shared replaying(_:onto:) helper used by both directions of the round trip. An unparseable write throws there instead of removing the key, because silently removing it would make the round trip pass by looking like "this preset does not override that action" — the exact failure the test exists to catch.

The two Vercel checks are red for an unrelated reason and glaeda marks both not required: the Vercel bot says "The provided GitHub repository does not contain the requested branch or commit reference", which is the fork-deploy authorization limit. The catch-up merge pulled main's web/ changes into this branch's history, which is what made Vercel try at all.

[teamleaderleo]

Caught up with main b681e7e943b; new head 6720ab9f1d5. This PR had gone CONFLICTING since its last green run, so it needed the merge before anything else could happen.

The merge resolved Resources/Localizable.xcstrings by key union only. Verified as an exact 3-way union (base 7174, ours 7176, theirs 7179, merged 7181 = |ours ∪ theirs|), nothing invented, nothing lost, no conflict markers, schema regeneration clean, verify-local.py green. No feature code changed.

Note that the "73 of 73 checks green" result I quoted earlier was for 853a96998cf, the parent of this merge, so the fresh run is what counts now.

The two Vercel checks are red here, but they are also red on #14863, on #15251 and on three of the last five commits to main, so they are not from this change.

[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutKeymapPreset.swift:
- Around line 94-95: Update matchesLegacyNextSurfaceShortcut to use the
effective .nextSurface binding and accept the legacy Ctrl-Tab path only while it
remains bound to Ctrl-Tab; apply the equivalent guard to .prevSurface. Ensure
rebound and unbound bindings do not trigger legacy surface cycling, and cover
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📥 Commits

Reviewing files that changed from the base of the PR and between d2a290b and e4edeab.

📒 Files selected for processing (9)

• Packages/macOS/CmuxSettings/Sources/CmuxSettings/Values/ShortcutKeymapPreset.swift
• Packages/macOS/CmuxSettings/Tests/CmuxSettingsTests/ShortcutKeymapPresetTests.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+Default.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/ShortcutKeymapPresetText.swift
• Resources/Localizable.xcstrings
• Sources/ContentView+KeymapPresetCommands.swift
• Sources/SettingsSearchAliases.swift
• Sources/SettingsSearchIndex.swift
• skills/cmux-keyboard-shortcuts/SKILL.md

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[teamleaderleo]

Caught up the fork branch with main through 3ed76f5883eaac2c5311ddd4027a23f87c784bf6.

• Merged the current main tip 8b756786e2c with scripts/merge-main.sh --tip. Earlier catch-up merges used the newest main commits with green guards: 478e3232b09, 204b936a2c4, and 0e44675036c.
• The Resources/Localizable.xcstrings conflicts were resolved with the registered key-level merge driver. Final exact three-way proof:

base=0e44675036c42b80be3f8e58aa3d495c3e37a5ed
ours=7386 theirs=7388 merged=7390 expected=7390
invented=[]
lost=[]

The check used expected = (ours | theirs) - ((base - ours) | (base - theirs)) and asserted merged == expected.

• python3 scripts/normalize-pbxproj.py --check cmux.xcodeproj/project.pbxproj passes.
• python3 scripts/verify-local.py passes all 5 selected checks: Swift syntax, XCStrings structure, localization parity, workspace package groups, and feature flag policy.

The failures from run 36454035854 were classified as follows:

• App-host shard 3/7, job 109044548991: three RemoteTmuxMirrorCLIObservabilityTests failed because newTerminalSplit returned nil during the old window and mirror topology fixtures. The catch-up includes the upstream fixture repairs from #15434, #15573, and #15765.
• App-host shard 7/7, job 109044548937: PaneResizeShortcutTests and SurfacePaneFactoryFocusTests failed with newTerminalSplit -> nil and .creationFailed("noSpace"). The same upstream fixture sizing repair from #15434 is now included.
• CLI product tests, job 109044548734: tests/test_claude_hook_clear_running_status.py observed a stale pre-clear SessionStart attempting to restore PID 11111. The branch already contains the SessionStart ownership guard, and the same suite passed on PR #15251 and the main full-suite run 36693529911.
• macOS status job 109073509281, tests job 109073558284, and ci-status job 109073605467 were aggregate/downstream failures from those three suites. No branch-specific source fix was needed after the catch-up repairs.

The current head is mergeable. CI has 64 passing checks, the two expected fork-blocked Vercel checks are non-required, and ci-status is waiting for macos / macOS compile admission on blacksmith-12vcpu-macos-26. No merge or auto-merge was enabled.

[teamleaderleo]

Review of 3ed76f5883e

Independent review, with the load-bearing findings verified in the source afterwards. The production change is four lines in one enum case, it ships no new bug, and the "existing bindings do not change" claim holds. Two things are worth fixing, and there is a stacking decision that probably supersedes this PR entirely.

Existing users are unaffected, verified rather than assumed

ShortcutAction+Defaults.swift is untouched and no default uses the Tab key at all. The preset is opt-in behind the confirm-before-write preview, there is no persisted preset key (active(in:) infers from the file and requires the preset's own plan to be empty), and nothing new is registered in CmuxConfigSchema.generated.swift because all four action ids were already there. Every enumeration site goes through allCases or a compiler-checked exhaustive switch, including the new keymapPresetKeywords(_:), so adding the case cannot silently miss a site.

Cmd+1 through Cmd+9 bounds are correct. ShortcutRoutingSupport.swift:133 guards Int(normalized) into 1...9, so Cmd+0 never matches. AppDelegate.swift:15881 maps digit 9 to selectLastSurface() and otherwise selectSurface(at: digit - 1), matching Chrome and Safari. Out of range is guarded by guard tabs.indices.contains(index). With three tabs, Cmd+9 goes to tab 3 and Cmd+4 through Cmd+8 are no-ops.

Two things I went in expecting are not true, and they are worth recording. There is no !terminalAlternateScreen predicate in the shortcut layer: ShortcutAction.defaultFocusWhenClause offers only focus and visibility clauses, and all four actions here fall to .always, so scoping these bindings by alternate screen is not currently expressible. And Cmd+W is not a collision risk, because closeTab and selectSurfaceByNumber both address the focused pane's bonsplit tab bar.

DEFECT 1: the legacy Ctrl+Tab path is ungated, so the new localized promise is false

Sources/AppDelegate.swift:16209 and :16220, matchers in AppDelegate+DockShortcutRouting.swift:350.

matchesLegacyNextSurfaceShortcut builds the Ctrl+Tab strokes from hardcoded constants and checks nothing about what the configured .nextSurface binding actually is. Twelve lines away, matchesGhosttyGotoSplitFallback does exactly the guard this path lacks:

return !KeyboardShortcutSettings.Action.allCases.contains { action in
    liveConfiguredShortcut(action, owns: event)
}

Failure scenario: the user picks Browser-style, sees Ctrl+Tab under Next Surface in Settings, then decides they want Ctrl+Tab back for vim or tmux and clears the binding. Configured dispatch no longer matches, execution reaches the legacy block, the legacy matcher accepts, and cmux still cycles surfaces. The sequence never reaches the terminal and no setting can make it.

The handler predates this PR, so the behaviour is not a regression. What is new is the promise: shortcut.keymap.summary.browserTabs now tells the user in nine locales that binding these here makes them "visible and rebindable in Settings". Visible is true. Rebindable is half true, and shipping the other half into nine translated locales is the expensive part to walk back.

Fix: mirror the matchesGhosttyGotoSplitFallback guard into both legacy matchers, covering rebound and unbound separately, since unbound is the case that matters for full-screen TUIs. If that is out of scope here, soften the localized string to what the code does.

This is the same finding as CodeRabbit's live comment on ShortcutKeymapPreset.swift:95, reached independently. Its "Minor" severity is right for shipped behaviour and understates the localization cost.

DEFECT 2: 13,402 lines of gratuitous reordering in Localizable.xcstrings

Semantically clean. Against the merge base 8b756786e2c: 2 keys added, 0 removed, 1 changed deliberately, both new keys present in all nine locales as translated. Nothing lost or invented.

The physical ordering is churned though: 124 keys genuinely out of place by longest-increasing-subsequence, 18,330 pairwise inversions. That is what turns a 3-key change into 13,402 diff lines, and it is why this branch has already gone conflicting on this one file three times, each costing a cold macOS CI cycle.

It also makes an earlier claim in this thread wrong. The 2026-09-28T10:09 comment says "12 inversions away from main's across 7,171 shared keys". At this head it is 124 out of place and 18,330 inversions. A reader uses that number to decide not to read the diff, so it needs correcting or dropping.

Fix: rewrite the catalog as main's key order with the three keys applied in place, so the diff is about 30 lines.

DEFECT 3: browserAndITerm2AreNotMistakenForEachOther has no power and does not test its own docstring

ShortcutKeymapPresetTests.swift:228. Assertion 1 is character-for-character line 217, assertion 2 is line 132. Delete the test and coverage is unchanged.

The docstring states the hazard correctly and then tests past it: Browser and iTerm2 write the same two numbered actions, so the ambiguous input is a file holding only those two shared bindings. This test never constructs it; applying a full preset is the unambiguous case. Replace the body with a snapshot of just selectSurfaceByNumber: cmd+1 and selectWorkspaceByNumber: cmd+opt+1 and assert active(in:) == nil, which is the "whole plan must be empty" rule the disambiguation actually rests on.

Test power

browserPresetBindsTheTabKeysAndTheNumberRow is strong and is the test carrying the PR: it asserts the exact four-action change set and each after value, so reverting any one of the four lines fails it. iTerm2RoundTripsThroughBrowser is moderate to strong, with the caveat that its asBrowser == applied(.browser) equality is tautological because both sides read from preset.overrides. browserPresetIsDetectedAndReversible is moderate, its reversibility half redundant with the existing parameterized switchingBackToCmuxRemovesEveryOverride. browserPresetLeavesTheShortcutsABrowserAlreadyAgreesWith has no power over this change, since it passes if case .browser returns [:]; it still pins the eight defaults the PR body's claim depends on, so it is worth keeping but should not be counted as covering the new code. browserAndITerm2AreNotMistakenForEachOther is zero, per DEFECT 3.

The pre-existing parameterized suites now cover .browser for free through allCases, and they are why I am not asking for more tests. presetsIntroduceNoCmuxConflicts in particular is what makes the paired Cmd+1 and Opt+Cmd+1 move mandatory.

Nits

The browser preset reuses the localized key shortcut.keymap.summary.iterm2Numbers for its number-row warning; the text is generic but the key name now lies about its scope. Renaming costs a nine-locale migration, so say which you chose rather than leaving it ambiguous. The Cmd+Shift+[ and Cmd+Shift+] trade warning is gated only on .nextSurface being in changes, so a user who hand-set .nextSurface but not .prevSurface gets no warning; gate on either.

One divergence worth confirming: the preset leaves Cmd+Shift+[ and Cmd+Shift+] unbound rather than repurposing them for moveSurfaceLeft and moveSurfaceRight. The doc comment explains why, since an action carries one binding and Ctrl+Tab displaces them. That is a deliberate choice, but it differs from how the feature was originally described, so it should be stated in the PR body.

This PR is subsumed by #15251

Verified: of the four browser-preset files, three are byte-identical between this head and ee7e9798fef, and the fourth differs only because #15251 adds chooser code to it. Every commit here that #15251 lacks is a main merge. If #15251 lands, this should be closed rather than merged. Leaving it open for now because the scope question belongs to the design call on #13742.

CI and verification

verify-local.py selected 5 checks, all passed; test-wiring run explicitly also passed, and it is clean because the one new test file is a SwiftPM package test rather than a cmuxTests/ file, so the registry does not apply. normalize-pbxproj.py --check clean, no pbxproj touched. Guard sweep exit 0 over 221 run blocks.

The red at this head is not from this PR. macos / app-host unit tests (6/7) failed with four 300-second timeouts, all in CloudWorkspaceCreationSidebarTests and CloudSidebarConsistencyTests; shards 1-5 and 7 were cancelled by fail-fast and so produced no signal rather than passing. This PR touches no cloud or sidebar file, and both test files changed on main recently. The log also shows "Could not take this Mac's gui token for the app-host tests", which is worth watching if the timeouts recur.

Not checked, and CI has to establish it: Swift compilation and any test execution. That matters here specifically because this branch previously shipped a test that did not compile and therefore never ran, hidden because a conflicting PR runs no checks at all.

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[teamleaderleo]

Re-resolved Resources/Localizable.xcstrings at 992a68dec1a so this PR is reviewable for the design call.

Catch-up merges had rewritten the catalog's member ordering, which made the diff 15,708 lines in that one file and 8,094/7,803 overall. The content was already correct, only the ordering had drifted. I spliced this branch's added and changed keys into main's exact bytes instead of regenerating the file, because the catalog is not key-sorted and a json.dumps round-trip diverges at byte 48.

Verified by parsing both blobs rather than by reading the diff: top-level keys equal, strings equal, whole document equal, 7,399 strings on both sides. The commit adds, removes and alters no key. The real catalog delta is two added keys and one changed key.

The PR now reads 308 insertions and 17 deletions over 9 files, 127 of them in the catalog.

CI is running on 992a68dec1a.

[teamleaderleo]

The red iOS rollup on 992a68dec1a is not from this change.

detect-ios-changes ran 15:42:27 to 15:47:31 and reports cancelled, which is what a timeout-minutes: 5 expiry looks like. The step that consumed the whole budget is Checkout workflow revision (actions/checkout), which never got past 15:42:28. Resolve requested revision and Detect iOS changes never ran. ios-tests then fails by design, because its routing guard refuses to pass when its dependency did not report.

So it is a hung checkout on a non-required job, not a routing regression. The same lane was success on the previous head 992f4de344, and the only delta between the two is the string-catalog reordering, which touches no iOS path. Re-running the lane; the required check here is ci-status.

[teamleaderleo]

Ran the merge-ref checks on this one too, against refs/pull/15222/merge (d5e25d9b24a3). Clean, and no catch-up merge needed.

• No duplicate catalog keys. All 23 .xcstrings in the merge ref parse with zero repeated keys. origin/main is clean too, so there is nothing inherited from a base that already fails the uniqueness guard. That matters for this PR in particular, since the whole change is a catalog splice.
• The submodule pin is already main's. The branch holds 83857fa043bd and so does the merge base d78434aa026e, so the branch never moved it and the merge ref takes main's bd340add9076 either way. A catch-up merge would leave CI building the identical submodule commit.
• No overlap. None of the 36 commits main has gained since the merge base touch a file this branch touches.

So the only thing left here is the re-run of the iOS lane, where detect-ios-changes hit its 5 minute ceiling inside Checkout workflow revision rather than failing on anything in the diff.

[teamleaderleo]

#15251 contains this PR in full

Measured on the two heads (992a68dec1af here, 51674b8a7dd3 on #15251), against each PR's own merge base with origin/main:

files this PR changes	9
of those, byte-identical on #15251's head	7
of those, extended (not changed) on #15251's head	2
Localizable.xcstrings keys this PR adds	2
of those, present on #15251's head	2

Both branches literally contain the same commit 11da26012bf "Add a browser-style base keymap preset". They are not stacked (neither head is an ancestor of the other, both target main) but they share that commit's history. The two files that differ are extensions, not divergences: ContentView+KeymapPresetCommands.swift gains the chooser's launch gate and skills/cmux-keyboard-shortcuts/SKILL.md gains the chooser's section. The only non-merge commit unique to this PR is 992a68dec1a "Re-resolve Localizable.xcstrings against main's ordering", which is an ordering fix, not content.

So whichever way the #13742 call goes, only one of these two needs to land:

• Preset plus chooser -> land Add a first-run base keymap chooser #15251 and close this one as included. This PR's content ships unchanged.
• Preset only, chooser deferred -> land this one, and Add a first-run base keymap chooser #15251 narrows to the chooser delta.

I am not pushing further catch-up merges here while the call is open. This PR carries full-ci, so every push is a cold macOS compile, and the head is already mergeable against current main.

One thing worth naming because it argues for landing only one of the two: if this PR squash-merges first, main gets the browser preset as a new commit with a different SHA from 11da26012bf. #15251's branch still has the original. A later catch-up merge on #15251 then has both sides adding the same Localizable.xcstrings keys from a base that has neither. GitHub builds refs/pull/N/merge with the default merge driver and ignores this repo's merge=xcstrings-v2 driver, which is exactly how duplicate keys have appeared only in CI before (#14876, #15349). Identical additions usually merge clean, but the ordering differs between main's squashed copy and the branch's copy, so it is not free. Landing one PR avoids the question entirely.

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[teamleaderleo]

This PR is CONFLICTING and therefore running no CI. The 10 macOS jobs that had been queued on 992a68dec1 for over 90 minutes will not report.

The cause is not feature code. GitHub computes mergeability with the default merge driver and ignores the .gitattributes entries this repo relies on (*.xcstrings merge=xcstrings-v2, cmux.xcodeproj/project.pbxproj merge=pbxproj-v1). main moved past the parent GitHub last merged against, and those commits touch both files. I hit the same thing on #15251 an hour ago; merging main locally with the drivers configured resolved it with zero conflicts.

I am deliberately not pushing that catch-up merge here yet.

#15251 is a strict superset of this PR: 9 shared files, 7 of them byte-identical and 2 extended, both shared xcstrings keys present, and the only non-merge commit unique to this branch is an ordering re-resolve. So there is no "take the chooser, defer the preset" option, and only one of the two should land. A catch-up merge on a fork PR costs a cold macOS compile, and right now ci.yml has 23 runs in progress and 37 queued, so spending one on the branch more likely to be closed is waste.

Once #13742 picks which of the two lands, I will catch that one up to main and let it run. If the call goes to this PR rather than #15251, say so and I will merge main here instead.

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[teamleaderleo]

Pushed f23df760985, a catch-up merge of main. No feature code changed.

Why it was needed

This PR had gone CONFLICTING, and a dirty PR runs zero checks, so the green checks above were from an older head. The conflict was not in feature code. .gitattributes routes two files through custom merge drivers:

*.xcstrings                     merge=xcstrings-v2
cmux.xcodeproj/project.pbxproj  merge=pbxproj-v1

GitHub computes mergeability with the default driver and ignores both, which is the same mechanism behind #14876 and #15349. main had moved 83 commits past the parent GitHub last merged against. Merging locally with the drivers configured produced zero conflicts.

What I checked on the merge result

A clean auto-merge is not the same as a correct one:

• Submodule gitlinks match origin/main exactly: ghostty, homebrew-cmux, vendor/bonsplit. A merge that silently reverts a gitlink stops main compiling.
• Both Localizable.xcstrings catalogs: 0 duplicate keys, parsed with object_pairs_hook rather than plain json.loads, which hides duplicates by keeping the last one.
• check-pbxproj.sh, lint-pbxproj-test-wiring.sh (1171 Swift files) and normalize-pbxproj.py --check: all clean, so nothing needs normalizing before this lands.
• verify-local.py: 16/16 affected checks.

Why I spent a compile on this one now

I said earlier I would hold this PR rather than burn a cold macOS compile while #13742 decides between it and #15251. One fact changed that.

#15251 edits cmuxUITests/KeymapChooserUITests.swift, and CI refuses that from a fork:

This fork pull request changes UI test classes (cmuxUITests/KeymapChooserUITests), which only a same-repository dispatch can run.

ui-tests rolls up into the required ci-status, so #15251 cannot reach green from the fork at all, no matter how long the queue takes. This PR touches no UI test class, so it is the one of the two that can produce a full green signal today. That is worth one compile, and #13742 needs the signal either way.

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[teamleaderleo]

Correction to the last paragraph of my previous comment.

I justified spending a compile here partly on #15251 being unable to reach green from the fork. That was true at its earlier head and is not true now: its ui-tests job is skipping with zero steps, because the UI test lane is off repo-wide (vars.CI_UI_TESTS_ENABLED), so the fork refusal never runs. Details on #15251.

The catch-up merge here was still the right call for the other reason I gave. This PR was CONFLICTING, which means it was running zero checks and its visible green was from an older head, and #13742 needs a live signal on whichever option it picks. Nothing about the merge itself changes.

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[teamleaderleo]

Attribution for the twelve failing checks at fea3c1c9a1d. None of them comes from this branch's content.

CLA Assistant (required): API rate limit exceeded for installation, verbatim, at 19:22:11Z.

CLA policy guard (required): same minute, same cause. All twelve offline regression matrices passed, ending at PASS: test merge regression matrix (15 cases), and then the job failed with the generic CLA policy validation rejected the proposed policy. That annotation is deliberately generic: scripts/ci/validate-cla-policy.rb rescues every PolicyError into one line so candidate-controlled diagnostics never reach a public check. One of the paths into it is api_json, which turns any non-2xx gh api response into fail!("GitHub API request failed for ..."). There is no retry and no rate-limit branch, so a 403 from the API reads identically to a rejected policy. Repo-wide in the 19:20-20:00Z window this workflow failed 151 times out of 288 runs across 51 distinct branches; after 20:00Z it is 135 out of 751. This branch changes no CLA file.

macos / swift-package-tests and macos / macOS compile admission: main's compile break, since fixed on main.

Packages/macOS/CmuxSettings/Sources/CmuxSettings/Stores/JSONConfigAtomicPublisher.swift:74:16: error: call can throw but is not marked with 'try'
Packages/macOS/CmuxSettings/Sources/CmuxSettings/Stores/JSONConfigStore.swift:601:63: error: reference to property 'fileURL' in closure requires explicit use of 'self'

Neither file is in this PR's diff. 610c1ff3e43 ("fix: compile cmux.json atomic publish under Xcode 26.3", #16190) is the fix, and it is on main now.

CI fast guards: FAIL: test_linux_failure_still_blocks_tests_after_macos_succeeds. This is staleness, not a defect here. Running that one function against this head reproduces the failure; running it against origin/main at 71bb553867c passes. The head is 33 CI files behind main, tests/test_ci_change_areas.py among them, so the guard is reading an old ci.yml with a new expectation.

guards / workflow-guard-tests / ci, guards / Guard status, linux-preflight, macOS admission gate, macos / macOS status, tests, ci-status: all downstream of the above.

The PR is CONFLICTING again, so no checks will run until the next push anyway. I am holding the catch-up merge rather than spending another cold macOS compile on it: main touched the two files with custom merge drivers 23 times in three hours, which re-dirties this PR roughly eight times an hour, and the change itself is still waiting on the keymap default decision in #13742. When that call lands, one catch-up merge picks up #16190 and the newer guard expectations together.

One byproduct worth its own fix, filed separately: tests/test_claude_hook_spool.py fails in teardown on #15251 with OSError: [Errno 66] Directory not empty, because the spool forwarder is a grandchild that nothing waits for before TemporaryDirectory.cleanup runs.

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[teamleaderleo]

Why this shows CONFLICTING, specifically, since the diffstat points the wrong way.

git merge-tree --write-tree --name-only origin/main <head> reproduces what
GitHub computes, because it does not run the .gitattributes merge drivers
either. Against current origin/main the only real conflict is:

CONFLICT (content): Merge conflict in scripts/localization-allowed-omissions.json

Resources/Localizable.xcstrings auto-merges. Its 13,828-line entry in the
three-dot diffstat is key reordering, not content: comparing parsed keys, this
branch is 6 keys ahead, 113 behind and 51 differing out of about 7,500, and the
catalog's key order is unstable across almost every main commit that touches it.

The conflict itself is an additive keep-both collision with entries main added
in the same region. Cheap, but worth validating the result parses, since a
keep-both in a JSON object can leave a duplicate key.

Still holding the merge rather than resolving it now. origin/main does not
compile (usesTemporaryConfig out of scope at CLI/CMUXCLI+AutoNaming.swift:271),
so a push buys a cold macOS compile on a full-ci PR and goes red on main's break
regardless. #16260 is the fix and is close. This PR is also still waiting on the
keymap default decision in #13742. When both clear, one catch-up merge picks up
the compile fix, the newer guard expectations and this resolution together.