fix(desktop): enable SnapShots shortcuts on GNOME 45–47

[MatthewFeroz]

What Changed

On GNOME without the GlobalShortcuts portal, register the selected SnapShots chord in the bundled extension and deliver activations to T3 over D-Bus. Keep the portal path when the interface exists; permission denials and other portal failures do not select the fallback.

The extension releases the binding when the app disconnects or the extension is disabled, rejects shortcut conflicts, suppresses key repeats, and ignores locked-session activations. Its shortcut connection has a separate bus name so it cannot block the existing capture connection. Bump the bundled extension to version 3 so setup offers the update.

Why

Fixes #12589. GNOME 45–47 can run the capture extension but cannot complete shortcut setup because their portal backend lacks GlobalShortcuts. This implements the extension-owned trigger proposed in the issue's accepted triage. It also handles GDBus reporting a missing interface as InvalidArgs, distinguishing that case from a missing property without matching translated error messages.

UI Changes

Recorded on this machine in an isolated Ubuntu 24.04 / GNOME Shell 46 / Wayland session with no GlobalShortcuts portal. The capture target is a separate GTK test window. These are actual desktop captures, not mocked UI states.

Before: the original shortcut adapter and extension v2 reproduce the missing-interface error with Done disabled.

After: the updated extension registers Ctrl+Shift+W and setup can finish.

Background capture: pressing Ctrl+Shift+W while the GTK window is focused captures that window and attaches it to the T3 draft.

Watch the 24-second background-capture recording · Inspect the captured image opened in T3

Validation

• 187 focused tests passed across desktop SnapShots, portal registration, extension authorization/lifecycle, extension installation, and real private-D-Bus integration.
• Desktop typecheck, targeted lint, formatting, and whitespace checks passed.
• Built the desktop and server. Reproduced the original setup failure, then verified setup completion and background capture in real nested GNOME 46 with the fixed build.
• Existing portal behavior is covered by tests; GNOME 48+ was not exercised in a live session.
• Desktop-only change. Settings and capture commands share the desktop service. Web/mobile clients, provider adapters, and wire contracts are unchanged.

Checklist

• This PR is small and focused on one reported bug
• I explained what changed and why
• I included before/after screenshots for the affected setup flow
• I included a video for the interaction

Implemented with GPT-6 through the Codex harness.

October 4 branch update

Merged upstream main at eac52f0087d9ba5dee5542f24788d1482affae43 into this branch without rewriting its history. Updated head: abbb7a534a1c185f60be267d27651c1cc59e039d.

• Focused regression run: Tests 181 passed | 2 skipped (183).
• Scoped typechecks passed for @t3tools/desktop. Targeted lint passed; formatting and whitespace checks passed.
• The merged source tree matches the locally validated tree. Existing screenshots and recordings document the original affected flow; this branch refresh was checked by command line. Platform-specific skips are preserved, and no new native UI verification is claimed.

Branch update validated with GPT-6.1 Sol through the Codex harness in T3 Code.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds a new GNOME-owned global shortcut path with D-Bus lifecycle and packaging changes, broadening the existing desktop runtime behavior beyond a simple bug fix. It also adds a new static-analysis suppression in an integration test, requiring human review under the configured criteria.

Notes:

• Diff unchanged. Approvability was decided on eligibility alone.

^{You can add or adjust custom eligibility rules. Learn more.}

[MatthewFeroz]

The CI failure was a stale private D-Bus test fixture advertising extension version 2 after the shipped metadata moved to version 3. Updated that fixture; the real D-Bus capture test and GNOME setup tests now pass (19 tests).

Regarding Macroscope's approvability note: the D-Bus shortcut addition is the fix for #12589, where GNOME 45–47 lacks the GlobalShortcuts portal. The test-only nodeBuiltinImport directive follows the existing private D-Bus integration fixtures, which need Node subprocess APIs to start an isolated session bus. The correctness and Effect convention checks passed. The requested human review remains necessary; this is not being treated as automatic approval.

[MatthewFeroz]

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Reviewing files that changed from the base of the PR and between 0f57674 and abbb7a5.

📒 Files selected for processing (2)

• apps/desktop/src/snapShot/DesktopSnapShot.ts
• package.json

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📝 Walkthrough

Walkthrough

The GNOME extension now accepts client shortcut bindings over D-Bus. PortalCaptureShortcut uses this path when the GlobalShortcuts portal is unavailable. Packaging, version fixtures, integration tests, and documentation were updated.

Changes

GNOME shortcut fallback

Layer / File(s)	Summary
Extension shortcut service apps/desktop/gnome-extension/*, package.json	The extension exposes asynchronous BindShortcut handling, manages accelerator grabs and sender ownership, emits ShortcutActivated, and packages shortcutService.js.
Portal fallback binding apps/desktop/src/snapShot/PortalCaptureShortcut.ts, apps/desktop/src/snapShot/DesktopSnapShot.ts	PortalCaptureShortcut uses GNOME fallback binding for supported missing-interface cases, claims a separate D-Bus name, converts the accelerator, handles activation, and tracks extension ownership.
Fallback validation and documentation apps/desktop/src/snapShot/*.test.ts, docs/internals/linux-snap-shot.md	Tests cover registration, conflicts, activation, cleanup, error handling, integration behavior, and extension version 3. Documentation describes the separate shortcut connection.

Priority: ⬆️ High

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix · Severity of issue fixed: High

Sequence Diagram(s)

sequenceDiagram
  participant DesktopSnapShot
  participant PortalCaptureShortcut
  participant GlobalShortcutsPortal
  participant T3SnapShotExtension
  participant GNOMEShell
  DesktopSnapShot->>PortalCaptureShortcut: initialize shortcut
  PortalCaptureShortcut->>GlobalShortcutsPortal: query GlobalShortcuts
  GlobalShortcutsPortal-->>PortalCaptureShortcut: interface unavailable
  PortalCaptureShortcut->>T3SnapShotExtension: BindShortcutAsync
  T3SnapShotExtension->>GNOMEShell: grab accelerator
  GNOMEShell-->>T3SnapShotExtension: accelerator activated
  T3SnapShotExtension-->>PortalCaptureShortcut: ShortcutActivated
  PortalCaptureShortcut->>DesktopSnapShot: invoke capture callback

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Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to abbb7

GNOME sessions with setup enabled can use the extension shortcut when the portal interface is missing. No concrete current-head issue warrants delaying this change.

Architecture Summary

Architecture risk: 🔵 Low · up to abbb7

The change affects 3 systems.

Changed systems: apps/desktop, docs, package.json

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — apps/desktop (service) was modified; 11 changed files map to changed impact.
• observed — docs (service) was modified; 1 changed file maps to changed impact.
• observed — package.json (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in apps/desktop/gnome-extension/bundle.json: Added "shortcutService.js" to the files array in bundle.json, so the new module is now included in the packaged extension output.
• observed — Modified behavior in apps/desktop/gnome-extension/extension.js: DBus XML adds a BindShortcut method taking name and accelerator string arguments, and a ShortcutActivated signal for shortcut binding.
• observed — Modified behavior in apps/desktop/gnome-extension/extension.js: enable() constructs a ShortcutService wiring grab/ungrab via global.display.grab_accelerator/ungrab_accelerator with Main.wm.allowKeybinding, watch/unwatch via Gio.bus_watch_name_on_connection/bus_unwatch_name, activate via emitting ShortcutActivated to the sender, and an availability check requiring Wayland, unlocked session, and non-greeter; it also connects the display's accelerator-activated signal.
• observed — Modified behavior in apps/desktop/gnome-extension/extension.js: Adds BindShortcutAsync which resolves ShortcutService.bind(sender, name, accelerator) before returning null, replying with org.gnome.Shell.Extensions.T3SnapShot.Failed and the error message on failure, replacing the synchronous BindShortcut DBus method.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 9 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue #12589 requires a usable GNOME shortcut when GlobalShortcuts is unavailable and continued portal use when supported. PortalCaptureShortcut adds the GNOME fallback for missing portal interfac…
Out of Scope Changes check	✅ Passed	The extension service, D-Bus changes, desktop wiring, version update, tests, fixtures, and documentation support the GNOME shortcut fallback in issue #12589. The reviewed change summary shows no unrel…
Title check	✅ Passed	The title clearly summarizes the main change: enabling SnapShots shortcuts on GNOME 45–47. It is concise and specific.
Description check	✅ Passed	The description explains the problem, the fallback behavior, scope, and verification. It links the fix to issue #12589 and reports focused tests and live GNOME validation. The required information is …

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 9 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 2

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🤖 Prompt to fix review comments

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Inline comments:
In `@apps/desktop/gnome-extension/shortcutService.js`:
- Line 19: Update ShortcutService.bind to make same-sender replacement
transactional: retain the existing accelerator, and if grab, watch, or any
subsequent replacement step fails, restore the previous binding and leave it
active before propagating the failure. Preserve normal release behavior for
successful replacements, and add a regression test covering a conflicting
replacement that confirms the original shortcut remains active.

In `@apps/desktop/src/snapShot/PortalCaptureShortcut.ts`:
- Around line 397-405: Update the GetNameOwner call in the GNOME owner lookup to
catch DBusError with type org.freedesktop.DBus.Error.NameHasNoOwner and throw
the actionable GNOME extension setup message; rethrow all other errors
unchanged, matching the existing BindShortcut UnknownMethod handling.

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📥 Commits

Reviewing files that changed from the base of the PR and between dfbb11b and 79c11f3.

📒 Files selected for processing (13)

• apps/desktop/gnome-extension/bundle.json
• apps/desktop/gnome-extension/extension.js
• apps/desktop/gnome-extension/metadata.json
• apps/desktop/gnome-extension/shortcutService.js
• apps/desktop/gnome-extension/shortcutService.test.js
• apps/desktop/src/snapShot/DesktopSnapShot.ts
• apps/desktop/src/snapShot/GnomeCaptureSetup.test.ts
• apps/desktop/src/snapShot/GnomeCaptureShortcut.dbus.test.ts
• apps/desktop/src/snapShot/LinuxSnapShot.dbus.test.ts
• apps/desktop/src/snapShot/PortalCaptureShortcut.test.ts
• apps/desktop/src/snapShot/PortalCaptureShortcut.ts
• docs/internals/linux-snap-shot.md
• package.json

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[MatthewFeroz]

Verified latest head 0f576741053a3bd3bda4d698b7da4b1bff19ba33: all CI jobs passed, CodeRabbit completed with no new actionable findings, both review threads are resolved, and Macroscope correctness and Effect conventions passed.

I am leaving CodeRabbit's non-blocking docstring-coverage warning unchanged: this repository's AGENTS.md asks us to document non-obvious constraints, not narrate control flow or add redundant documentation. The service ownership/lifetime contract is documented next to the service, and the separate D-Bus identity constraint is explained in the existing Linux SnapShot documentation. Adding boilerplate solely to reach an 80% docstring metric would not improve those explanations.

Macroscope's neutral approvability check still requires human review for the new GNOME shortcut/D-Bus behavior. No approval or merge is implied by the passing CI.

[Luzivog]

Reproduced on a stock Ubuntu 24.04 install (real hardware, not a nested session): GNOME Shell 46.0, Wayland, xdg-desktop-portal 1.18.4, xdg-desktop-portal-gnome 46.2, T3 Code 0.0.43-nightly.20260923.

Same as #12589: snap-shot@t3.codes v2 is ACTIVE and answers on D-Bus, and the Screenshot portal is version 2, so capture goes through the extension. The shortcut step fails with No such interface "org.freedesktop.portal.GlobalShortcuts", and the portal object doesn't export that interface. Closing the dialog then turns SnapShots back off, so the feature can't be used on 24.04 at all.

I'd love to see this merged.