[RedBearAK]

This does one small thing: with several workbooks open, the Window menu lists them and lets you switch between them. Nothing more. It is not multi-window support (#162, #171), and it deliberately avoids anything that work would have to undo.

Today several workbooks can be open in GridCraft's one window, but nothing in the interface moved between them: the Mac's Window menu had New Window and the sheet keys only, the ribbon's View › Window group had no Switch Windows, and the one route was window.activate {index} over the control channel. On the Mac the Window menu also showed the app's single window as an entry titled after the active document, always checked, which looked like a second document list.

The part I'd like a second opinion on is the shape, since the point was to be plug-and-play for whoever does the real multi-window work: the engine identifies a window by its document, not by its position, and window.list, window.activate {id}, window.next and window.previous are meant to stay the one API. A build that gives each workbook its own native window maps those windows to the same ids, and the Mac menu's document list then simply becomes macOS's own window list. If that shape is wrong for where you want to take windows, I'd rather hear it now than have this be a headache later.

Summary

• The engine identifies a window by its document rather than by its position in the list, so an id stays valid when another document closes. window.list (and view.switchWindows) report id, index, title, path, dirty, active, hidden; window.activate takes an id or an index and unhides; window.next / window.previous cycle the visible windows and wrap; hidden windows are kept by document, hiding the last visible one is refused, and closing a document never leaves a hidden window active.
• View › Window › Switch Windows, as in Excel: the open workbooks numbered, the active one checked, a dirty one marked; Alt, W, W opens it.
• Ctrl+F6 / Ctrl+Shift+F6 and Ctrl+Tab / Ctrl+Shift+Tab cycle the windows, while a cell or text box is being edited too. A switch commits the entry first (the editor is not document-aware, so left open it would carry on in the other workbook); an entry that can't be committed, a bad formula or a validation rule, keeps the switch from happening and shows its own reason. A switch also drops the object selection (chart ids start at 1 in every workbook); scroll position and selection of each workbook survive a switch away and back. With many workbooks the drop-down scrolls.
• On the Mac, the native Window menu lists the open workbooks with a check on the active one and offers Next Window (Cmd+`) and Previous Window (Cmd+Shift+`). The documents come last, as in Excel's Window menu. The app's one window is kept out of AppKit's own list for that menu, which had shown it once more under the active document's title with a permanent check (checked by eye on my Mac; the AppKit test's headless NSApp has no window to exclude). muda places and removes items by position while macOS adds entries of its own to the windows menu, so a changed set of documents replaces the whole submenu in the menu bar instead of editing it in place; titles and check marks change in place. Show Formulas moves to Control+` on the Mac, which is Excel for Mac's binding, so Cmd+` does one thing.

Why by document: a window-per-workbook implementation maps its native windows to the same ids and keeps window.* as the one API; the Window menu's document list then becomes macOS's own window list. The pieces are kept apart for that: a pure window_entries function feeds the Mac menu, the ribbon reads window.list, and the engine owns the identity.

Tests: the engine's window commands (activate by id after an index shift, next/previous wrap and skip hidden windows, a hidden window surviving another document's close, the last visible window refused, hostile ids); the ribbon drop-down and the four shortcuts through the UI harness (cycle and wrap, on Linux/Windows and Mac modifiers, one-window no-ops without a message, scroll and selection restored, a cell entry and a text-box draft committed by a switch from the menu and from the shortcuts, a refused entry stopping the switch with its own message, a later error still shown over an earlier message box); the Mac menu's entries, ids and accelerators, plus an AppKit test that reads the NSMenu back from NSApp after switching, retitling, closing and hiding, checking the end of the menu so that items macOS appends of its own would not disturb it (the headless NSApp appends none, so that part is not exercised).

Docs: docs/ui-parity.md (new row, the shortcut table), docs/hardware-parity.md, docs/gaps.md, ROADMAP.md.

A later cold review of the diff found that the four shortcuts had done nothing while a cell or text box was being edited: the grid's keyboard handler stands back for the editor, and the commit-then-switch path was reached only from the menus and the control channel. They now go through there as well, with tests. The same review found that my change to the alert helper, meant to keep a cell entry's own message over the refusal, had also kept any message box over a later error; that is now handled only where the refusal arises.

On my Mac every gate step passes except header_autofit::table_filter_autofit_works_through_command_and_header_double_click, which fails on current main as well (macOS font metrics, from #1320).

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• crates/ui-egui/tests/it/keytips_generated.rs
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Walkthrough

The change adds document-ID-based window commands, workbook switching through the View menu and keyboard shortcuts, and a synchronized macOS Window menu. It also adds edit-commit handling for document changes, updates shortcut mappings, and expands engine, UI, and AppKit tests.

Changes: Workbook Window Switching

Layer / File(s)	Summary
Document-based window state and commands crates/engine/src/lib.rs, crates/engine/src/cmd/*, crates/engine/src/tests.rs	Window commands now list, activate, cycle, hide, and unhide documents using stable IDs or indices. Hidden state follows document IDs when documents close or change index. Tests cover command results, selection, and hidden-window behavior.
Workbook switching in the UI crates/ui-egui/src/keymap.rs, crates/ui-egui/src/lib.rs, crates/ui-egui/src/ribbon.rs, crates/ui-egui/src/keytips/*, crates/ui-egui/tests/it/*, docs/*, ROADMAP.md	The View menu and keyboard shortcuts switch between workbooks. The UI commits edits before document changes and clears selected chart and grid trace state after successful changes. Tests and documentation cover switching controls and shortcuts.
macOS Window menu synchronization apps/gridcraft/Cargo.toml, apps/gridcraft/src/main.rs, apps/gridcraft/src/native_menu.rs, apps/gridcraft/tests/mac_menu_appkit.rs	The AppKit Window menu lists visible workbooks, marks the active workbook, labels edited workbooks, and activates a selected document. Its entries update when documents change. Tests cover menu contents and synchronization.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  actor User
  participant SwitchingControls
  participant SheetAppRunCommand
  participant EngineWindowCommands
  User->>SwitchingControls: Select a workbook or invoke a switching shortcut
  SwitchingControls->>SheetAppRunCommand: Dispatch a window command
  SheetAppRunCommand->>EngineWindowCommands: Commit edits and execute the command
  EngineWindowCommands-->>SheetAppRunCommand: Return the active document
  SheetAppRunCommand-->>User: Show the active workbook

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Possibly related issues

• storytold/gridcraft issue 162: The change adds in-window workbook switching, but does not add native windows for open workbooks.
• storytold/gridcraft issue 2377: The change adds workbook navigation in one application window through menus and cycling commands.
• storytold/wordcraft issue 3890: The change adds workbook switching in one window, but does not add the requested multiple-window support.
• storytold/craft-launcher issue 833: The change adds workbook navigation within GridCraft, but not a shared cross-application workspace or tab bar.

Suggested reviewers: marcoarnulfo, vangel76, echelon

Merge Risk: Minimal · up to f9f4c

Workbook switching preserves the edit boundary, and the identified documentation issues are corrected. No outstanding issue identified here prevents merging after normal checks.

Security architecture risk: Low · up to f9f4c

Workbook selection remains limited to open documents, with validation and edit-commit controls protecting transitions. No introduced security issue was established. Compatibility with existing automation clients remains uncertain because several command results and failure behaviors change.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The inspected change affects open workbooks, their path metadata, and pending edits within a desktop session. Listing exposes additional document metadata, but the existing control interface already provides workbook read/write and file operations; no new privilege level was established along this route.

Trust Boundaries and Controls

• observed — The existing optional control server binds to 127.0.0.1 and accepts structured command requests. Loopback binding limits network reach but is not local-peer authentication. The listener and dispatcher are unchanged in the full PR comparison, and the new window commands use that existing authority path.
• observed — Native-menu item IDs encode document UIDs separately from display titles. Menu events check that the UID still exists before dispatch, and engine selection validates membership again. A stale menu entry therefore does not select a different workbook merely because indices shifted.

Resilience and Maintainability Implications

• observed — Repeated next or previous commands intentionally advance state again. The unchanged control transport drops abandoned requests that have not started, but reports an unknown outcome when a started request times out; it does not promise exactly-once window transitions after such a timeout.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 40.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 104 functions across 16 files. (4 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the primary change: adding Window menu support to switch between open workbooks.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 40.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 104 functions across 16 files. (4 skipped: 4 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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Actionable comments posted: 3

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Review comments at @docs/hardware-parity.md:
- Line 14: Update the “Multiple windows and monitors” row so the literal
backticks in the Cmd shortcut notation are escaped; preserve the later window.*
text as its own valid inline code span.

Review comments at @docs/ui-parity.md:
- Line 37: Escape the literal backticks used in the Cmd+` and Control+` key
names in the affected table cells so they do not form unintended Markdown code
spans. Preserve the existing code spans around window.list, window.activate
{id}, window.next, and window.previous.

Review comments at @ROADMAP.md:
- Line 138: Escape the literal backticks in the 2026-10-22 “Switching between
open workbooks” ROADMAP entry, including those in the Mac key names and
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🟡 Minor · Update the document header date. · hardware-parity.md:23

docs/hardware-parity.md:23
📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Update the document header date.

This revision is dated October 22, 2026, but the header still says “Last updated: 2026-10-12”. Update the header to keep the document metadata accurate.

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Review comment at @docs/hardware-parity.md at line 23:
Update the “Last updated” header in the hardware parity document to October 22,
2026, matching the revision date shown in the entry.

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[RedBearAK]

@coderabbitai The header dates of docs/hardware-parity.md and docs/ui-parity.md now say 2026-10-22 with this change named, in the amended commit.

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🧠 Learnings used

Learnt from: CR
Repo: storytold/gridcraft PR: 0
File: docs/parity-checklist.md:0-0
Timestamp: 2026-10-19T18:13:15.777Z
Learning: Applicability reference:
AGENTS.md: # GridCraft — instructions for agents
## Roadmap
`ROADMAP.md` (committed) is the one-page summary: stage, headline numbers, dimensions, languages, progress log. It follows craftrules `standards/progress-docs.md` and points at the detail in `docs/`: `target-app-parity.md` (authoritative assessment), `gaps.md` (ranked work list: pick from it), `roadmap.md` (current focus, beta gates, milestones), `architecture.md`, and the area checklists `function-parity.md`, `chart-parity.md`, `file-format-parity.md`, `ui-parity.md`, `hardware-parity.md`, `localization-parity.md`. Update the affected docs (and their timestamp lines and revision history) whenever work lands. `cargo xtask parity` regenerates `docs/parity-checklist.md` from `crates/engine/src/catalog.rs`.

Source excerpt:
# Excel parity checklist

Each entry is an Excel ribbon or menu command (feature names only). It counts as implemented when GridCraft registers a command with the same id. This measures breadth only; the overall assessment (depth, fidelity, effort) is in [target-app-parity.md](target-app-parity.md).

_{You are interacting with an AI system.}

[FredApps]

Read the whole diff at 1441777. gate / gate (ubuntu-24.04) and SonarCloud pass on this head.

The engine side is solid and tested: windows are identified by the document uid rather than an index, hiding by uid survives a close that shifts indices, set_active unhides, close_document never leaves a hidden window active, hiding the last visible window is refused, and window.next and window.previous wrap and skip hidden windows. The selector handling is strict (a given but unusable id or index is an error, id wins) and the tests include the last-visible-window close case.

One limit on this approval: the macOS-only parts (native_menu.rs window-list sync, the windowsMenu replacement and the AppKit exclusion, and tests/mac_menu_appkit.rs) are not built or run by the checks listed on this head, so for those I can only say the code reads correctly, including the rebuild-the-submenu approach and the dependency change in apps/gridcraft/Cargo.toml.

[RedBearAK]

Rebased onto current main (f284f6a). Besides doc headers and the appended engine tests, this one had a real merge in crates/engine/src/lib.rs with #462: the recorder and depth fields now sit next to the uid-based hidden_windows list, and close_document keeps #462's line that drops the closed document's open undo groups, beside this branch's hidden-list cleanup and active-window handling. DocState::new gained a trust argument in #462, so the three_windows test fixture passes Trust::Local. Nothing else in the commit changed. Full gate run locally on the rebased commit.

[RedBearAK]

Rebased onto current main (3099df9). The only conflict was again the end of crates/engine/src/tests.rs, where #2420 and this branch both append tests, so the eight window tests now live in their own file, crates/engine/src/tests/windows.rs, declared near the top of the test file the way #462 did with tests/seams.rs; the tests themselves are unchanged. No non-test code changed in the rebase. Full gate run locally.

[FredApps]

gate and SonarCloud pass at this head. Read the engine and macOS menu source. Windows are now identified by the document uid instead of an index that shifts when a lower document closes: window.list, window.activate (id wins over index, a given but invalid selector is an error), window.next and window.previous (wrapping over visible windows), and hide/unhide that refuse to hide the last visible window and unhide the most recent. The Window menu rebuilds its submenu only when the set of documents changes and updates titles and checks in place, and a click on a document closed since the menu was drawn is ignored. The AppKit-only parts (native_menu, the objc2 dependency move) are not built by the Linux gate, so they were read but not run. The tests were skimmed. No defect found.

[RedBearAK]

Rebased onto current main (17b9f6f). The one conflict was in docs/ui-parity.md: the header line, and the keyboard table, where main has since replaced the row that listed Ctrl+Shift+U as missing and this branch adds the Ctrl+F6 / Ctrl+Tab row next to it; the merged table keeps main's rows and adds this branch's. No code changed in the rebase. Checked locally on the rebased commit: fmt, clippy with -D warnings, and the engine and ui-egui test suites (the one failure is header_autofit, which fails the same way on untouched main on this Mac).

[RedBearAK]

Rebased onto current main (6f0e43c), past the 0.12.1 release and the egui 0.37 migration. The text conflicts were only the "Last updated" header lines in ROADMAP.md and docs/ui-parity.md; both keep main's entry, with this branch's added in front of it.

The egui 0.37 migration needed three small changes in this branch's own code, folded into the commit: the Switch Windows button and its menu entries use egui::Role::Button instead of the deprecated egui::WidgetType::Button, and the list-scrolling test's Event::MouseWheel gains the new source field (MouseWheelSource::Unknown, as main's other tests use). Nothing else changed.

Checked locally on the rebased commit: fmt, clippy with -D warnings, the workspace tests, doc tests, and the xtask assets, layers, parity, keytips and wasm checks. The two failures are the interaction tests column_autocomplete_folds_case_beyond_ascii and language_switch_renders_the_ribbon_and_persists, which panic in egui's font loading on this Mac on untouched main too.

[aiongg]

On the shape question: the window-per-workbook PRs (#2616–#2619) need a window id separate from the document, because New Window (#2617) puts two windows on one workbook. Their commands take window or doc (window.activate {window | doc | index}).

[RedBearAK]

Closing this in favour of #2616–#2619, which landed the window-per-workbook design. Thanks @aiongg for answering the shape question: with New Window putting two windows on one workbook, identifying a window by its document doesn't hold up, and main's window ids now cover what this PR did (Switch Windows, the window commands, settling a cell entry before a switch, the open workbooks in the Mac's Window menu).

The one thing left here was cycling with Ctrl+F6 / Ctrl+Tab. With each workbook in its own native window, that's the desktop's job now: Cmd+Grave on macOS, and the window switcher on other desktops.