[jhedlund]

Summary

Closing the main window on Windows tore down buzz-desktop.exe and every buzz-acp.exe agent-session child with it. macOS already intercepts the close and hides the window instead, but that whole RunEvent::WindowEvent arm — and the tray it relies on to get back — is gated to macOS.

Add the Windows sibling: hide the main window on close, and register a notification-area icon that reopens Buzz on left click and offers Open and Quit on right click. The tray is also the quit path, because Alt+F4 and the taskbar's Close both raise the same CloseRequested event and Windows has no Buzz menu bar.

Relaunching Buzz while it is hidden now unhides it as well; the single-instance handler only focused the window, which is a no-op when the window is hidden.

macOS and Linux behavior is unchanged.

Related issue

Refs #2412 (possibly closes it, but in case that is also other non-Windows behavior)

Testing

Built and installed on Windows 11, new taskbar item:

With Open Buzz, and Close Buzz options on right-click. Closing Buzz hides Buzz but keeps the process running and the taskbar item, and one left-click re-opens Buzz.

[jhedlund]

Further testing:

• cargo test --manifest-path desktop/src-tauri/Cargo.toml — 2650 passed, 0 failed, including 6 new tests covering menu-id dispatch and tray click filtering (left vs right, Up vs Down — right click must fall through to the context menu, and acting on Down would fire twice). CI's windows-rust job runs this same command, so the Windows-gated tests execute there.
• cargo clippy --workspace --all-targets — clean. cargo fmt --check — clean.
• Verified against a real build, not just types: posted WM_CLOSE to the Tauri window and confirmed the process stayed alive with the window hidden rather than destroyed; relaunching the exe returned it to visible in the original process.

[jhedlund]

I just read through #4024 which was tagged on #2412, let me know if it would preferable for this to be a toggle in Settings, on or off by default, I can add that into this PR

[github-actions]

🔐 Codex Security Review

Status: review required for the current range.

The current range is c3132c3ee982d194cd0198ad07b57ec8bd726e4e...fb1f76ab10334d7cdefc0a2ceb48b106d80c88af.
A new review must complete for this exact range. When manual authorization
is required, a Block organization member must comment exactly
@buzz-security-review fb1f76ab10334d7cdefc0a2ceb48b106d80c88af to authorize a new review.
Any previous review applies only to its recorded range.

[Minsiki]

Tested an equivalent change on Windows 11 (built from desktop-v0.5.28):
closing the main window hides Buzz to the notification area, left-click
reopens it, the right-click menu works, and relaunching from the Start menu
shortcut unhides the hidden window. Would love to see this land. 👍

[jhedlund]

I've ported this to the 1.0 desktop: block/buzz-app#3452. I'll leave this one open for 0.x unless you'd rather I close it.