Ghostty crashes on macOS when trying to go to non-native fullscreen

[dzhlobo]

Issue Description

I updated Ghostty and it started crashing on launch.

I've sent a crash report to Sentry 2d6dae56-30cb-4ba9-be8f-d702542dbd2d.ghosttycrash (event id 6d094e52-d976-492f-2827-3f695105f9eb).

I think it's related to non native fullscreen behaviour. I pulled the latest code and launched it in XCode and it crashes. The stack trace is:

Fatal error: Negative value is not representable

• ghostty/macos/Sources/Helpers/NSWindow+Extension.swift

  Line 6 in 2bcd76c

  CGWindowID(windowNumber)

• ghostty/macos/Sources/Helpers/Fullscreen.swift

  Line 363 in 2bcd76c

  let spaces = CGSSpace.list(for: window.cgWindowId)

• ghostty/macos/Sources/Helpers/Fullscreen.swift

  Line 171 in 2bcd76c

  guard let savedState = SavedState(window) else { return }

• ghostty/macos/Sources/Features/Terminal/BaseTerminalController.swift

  Line 336 in 2bcd76c

  fullscreenStyle.enter()

• ...

If I don't use non-native fullscreen Ghostty doesn't crash.

I think it's related to changes in 8bab8f7#diff-0134fd2fc727c1f12727bff8d71fdff6d655e2e97e5c3ccba284d9b74596177e.

Reproduction Steps

1. Add macos-non-native-fullscreen = true to ghostty config.
2. Open Ghostty.

Ghostty Version

Ghostty 1.1.4-main+2bcd76c3

Version
  - version: 1.1.4-main+2bcd76c3
  - channel: tip
Build Config
  - Zig version: 0.14.0
  - build mode : builtin.OptimizeMode.ReleaseFast
  - app runtime: apprt.Runtime.none
  - font engine: font.main.Backend.coretext
  - renderer   : renderer.Metal
  - libxev     : kqueue

OS Version Information

macOS 15.4.1 (24E263)

(Linux only) Display Server

None

(Linux only) Desktop Environment/Window Manager

No response

Ghostty Configuration

macos-non-native-fullscreen = true
fullscreen = true

Additional Relevant Configuration

No response

I acknowledge that:

• I have reviewed the FAQ and confirm that my issue is NOT among them.
• I have searched the Ghostty repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.