fix(desktop): zoom the app from keypad shortcuts and Ctrl+wheel

[Mnigos]

Fixes #10238

Problem

App zoom only reacted to Ctrl/Cmd with +, - and 0 on the number row. The numeric keypad sends its own key codes (numadd, numsub, num0), so those shortcuts did nothing, and Ctrl+mouse-wheel did nothing either: Chromium reports wheel zoom as a zoom-changed event on the webContents and leaves applying it to the app, and nothing listened for it. Since the font-size settings do not scale every element, users concluded there was no whole-interface zoom at all.

Fix

• DesktopApplicationMenu: hidden View items with CmdOrCtrl+numadd, CmdOrCtrl+numsub and CmdOrCtrl+num0 that route to the same zoomMain handlers as the visible items, so the menu still lists each command once.
• DesktopWindow: the main window's webContents now handles zoom-changed (Ctrl+wheel; Electron keeps visual pinch zoom separate and off by default, so pinch is not claimed here) through the same zoomWindow step as the menu, including putting embedded preview guests back at their own zoom. A preview guest under the pointer emits its own zoom-changed on its own webContents, so it keeps its independent zoom as before.

Verification

• DesktopApplicationMenu.test.ts: each keypad accelerator exists, is hidden, and dispatches the matching zoom action.
• DesktopWindow.test.ts: zoom-changed on the main webContents moves the zoom level in Electron's 0.5 steps and re-applies the preview zoom after every step.
• Desktop typecheck and lint.

Native check on macOS (Apple Silicon, macOS 15.7.5)

Dev build of this branch vs. an unpatched main worktree, driven with OS-level CGEvent key and wheel events into the T3 Code (Dev) window (focus verified before every event, dev app only), screenshots measured by sidebar width in physical pixels (baseline 509 px, one zoom step in 558 px, two steps out 465 px) with an example.com preview open in the right panel:

Input	main	this branch
Cmd + = / - / 0 (number row)	zooms	zooms
Cmd + keypad + / - / 0 (key codes 69 / 78 / 82)	zooms	zooms
Ctrl + wheel over chat content	no change	no change
Preview heading while the app zooms	35 px → 35 px	35 px → 35 px

Two platform facts explain why macOS cannot show either gap, and why the report came from Windows:

• macOS menu accelerators match the typed character, so the keypad's +, - and 0 already hit the existing CmdOrCtrl+Plus / - / 0 items there. Windows and Linux match virtual key codes, where the keypad is VK_ADD / VK_SUBTRACT / VK_NUMPAD0, which is what the new numadd / numsub / num0 items cover.
• Chromium does not treat Ctrl+wheel as zoom on macOS at all (WebContentsImpl::HandleWheelEvent is wrapped in #if !BUILDFLAG(IS_MAC), "the OS already has a gesture to do this through pinch-zoom"), so zoom-changed never fires there. On Windows and Linux it fires and the new listener applies the zoom.

So the macOS run confirms no regression on the number row and that the preview keeps its own zoom, and the unit tests cover the two new paths; a Windows or Linux run is still the only way to see the keypad and wheel gaps close natively.

Implemented with Claude Code (Claude Fable 5).

Note

Add test for numeric keypad zoom accelerators in DesktopApplicationMenu

Adds a test in DesktopApplicationMenu.test.ts that verifies each numeric keypad zoom accelerator dispatches the correct zoom action (in, out, reset) and that the corresponding View-menu items stay hidden.

^{Macroscope summarized 0c53e91.}

Summary by CodeRabbit

• New Features

  • Added numeric keypad shortcuts for zooming in, zooming out, and resetting zoom.
  • Added Ctrl+wheel and pinch zoom controls in the desktop window.

• Bug Fixes

  • Zoom changes now consistently update the main window and its controls.
  • Preview zoom is preserved when changing the main window’s zoom level.

[macroscopeapp]

Approvability

Verdict: Approved at 0c53e91

Macroscope's review found this PR approvable — This is a focused desktop zoom bug fix: keypad shortcuts and Ctrl+wheel now reuse the existing main-window zoom path, while embedded preview zoom is restored as before. The production changes are localized and accompanied by targeted tests, with no schema, configuration, or deployment impact.

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[juliusmarminge]

Reviewed d8701730 against current main bd16b86d. No confirmed code regression found. The hidden keypad shortcuts, captured-window wheel handler and shared preview-restoration path keep this focused; I would not add a guest-input fallback, since preview input ownership is deliberately separate.

I independently passed all 30 tests in the two changed desktop suites. Running the two new controls with the exact main production files gives the expected failures: missing keypad declaration and missing zoom-changed listener. These are source/service controls with fake Electron boundaries, not native input verification. The current-head CI and existing review threads are clear.

Before landing, could you attach a short native before/after check of number-row and keypad +/-/reset, plus Ctrl+wheel over app content with a preview present? The reported Windows setup would be the strongest match. Please leave the pinch claim qualified unless it is tested too: Electron documents wheel zoom separately from visual pinch, which is disabled by default. No new guest behavior is requested.

I have not merged this or closed #10238. The remaining gate is actual input evidence, not a request to broaden the implementation.

Reviewed by GPT 6 Astra via Codex in T3 Code.

Dismissing prior approval to re-evaluate 0c53e91

[Mnigos]

@juliusmarminge ran a native check on macOS (Apple Silicon, macOS 15.7.5): OS-level key and wheel events into the T3 Code (Dev) window of this branch and of an unpatched main worktree, screenshots measured by sidebar width, with an example.com preview open in the right panel. The full table is in the PR description.

Number row, keypad and reset all zoom the app, and the preview keeps its own size while the app zooms (heading stays 35 px while the sidebar goes 509 → 558 px):

baseline	Cmd + keypad +	zoomed app, preview unchanged

Two things macOS cannot show, and I think they are why the report came from Windows:

• Keypad + / - / 0 already zoom on unpatched main here. macOS menu accelerators match the typed character, so the keypad hits the existing CmdOrCtrl+Plus / - / 0 items. Windows and Linux match virtual key codes (VK_ADD vs VK_OEM_PLUS), which is what the numadd / numsub / num0 items are for.
• Chromium does not treat Ctrl+wheel as zoom on macOS at all: WebContentsImpl::HandleWheelEvent is wrapped in #if !BUILDFLAG(IS_MAC) ("the OS already has a gesture to do this through pinch-zoom"), so zoom-changed never fires here on either build. On Windows and Linux it fires and the new listener applies the zoom.

So the native evidence covers no regression on the number row and the preview independence; the keypad and wheel gaps only close on Windows or Linux, where I have no machine. If the reporter or someone with a Windows build can try a nightly once this lands, that would be the real confirmation. The pinch claim is gone from the code comment and the description.

[AlexanderReaper7]

I can test it on windows 11, is there a compiled version with this in it already or do i need to compile this branch myself?

[Mnigos]

I can test it on windows 11, is there a compiled version with this in it already or do i need to compile this branch myself?

Thanks, a Windows check would be great. There is no prebuilt build for this branch (CI skips desktop previews for fork PRs), so it needs to run from source:

git clone https://github.com/Mnigos/t3code.git -b desktop-zoom-inputs
cd t3code
vp i
vp run dev:desktop

That starts the Electron dev app against the local server. Things to try: Ctrl + keypad plus / minus / 0 zoom the app, Ctrl + mouse wheel over the app zooms it, and a page open in the preview panel keeps its own zoom while the app zooms.

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• apps/desktop/src/window/DesktopApplicationMenu.test.ts
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📝 Walkthrough

Walkthrough

The desktop app adds numeric keypad zoom accelerators and handles zoom-changed events from the main window. Shared zoom logic updates the window and reapplies preview zoom.

Changes

Desktop zoom inputs

Layer / File(s)	Summary
Shared zoom handling apps/desktop/src/window/DesktopWindow.ts, apps/desktop/src/window/DesktopWindow.test.ts	zoomWindow centralizes zoom updates. The main window handles zoom-changed events and reapplies preview zoom. Tests cover zoom levels and preview synchronization.
Numeric keypad menu accelerators apps/desktop/src/window/DesktopApplicationMenu.ts, apps/desktop/src/window/DesktopApplicationMenu.test.ts	The View menu adds hidden CmdOrCtrl+numadd, CmdOrCtrl+numsub, and CmdOrCtrl+num0 items. Tests verify visibility and dispatched actions.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~15 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge, bil0000

Merge Risk: 🟡 Moderate · up to 8c61f

Ctrl+wheel can zoom farther than intended. Switch the main window to application-managed zoom before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the two main fixes: numeric keypad zoom shortcuts and Ctrl+wheel zoom in the desktop app.
Description check	✅ Passed	The description explains the problem, implementation, verification, platform limitations, and preview zoom behavior. It does not use the template headings or include the checklist, screenshots, or vid…
Linked Issues check	✅ Passed	The pull request meets the coding requirements in issue #10238. DesktopApplicationMenu.ts adds hidden CmdOrCtrl+numadd, CmdOrCtrl+numsub, and CmdOrCtrl+num0 items that reuse the existing zoom …
Out of Scope Changes check	✅ Passed	The changes stay within issue #10238. The production changes implement numeric-keypad zoom and Ctrl+mouse-wheel zoom. Preview-zoom preservation and zoomWindow extraction support this behavior. The a…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4…

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Actionable comments posted: 1

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Inline comments:
In `@apps/desktop/src/window/DesktopWindow.ts`:
- Around line 684-686: Set the main window’s webContents zoom mode to manual
after creating the window and before registering the zoom-changed listener,
while preserving the existing zoomWindow handling and event behavior.

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• apps/desktop/src/window/DesktopApplicationMenu.test.ts
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