Dragging tab to new window crashes ghostty

[domi413]

Issue Description

When clicking on the "View open tabs" overview, I can drag the tabs out of the current terminal-window to spawn a new window. This works fine until there's only one window left. If I drag to only remaining window out of the current one, ghostty crashes.

Here's a clip that will explain this better: (sorry for the quality...)

Untitled.mp4

Expected Behavior

This is how ptyxis handles it:

Actual Behavior

Described above

Reproduction Steps

"described" in the video

Ghostty Logs

No response

Ghostty Version

Ghostty 1.2.0-arch1

Version
  - version: 1.2.0-arch1
  - channel: tip
Build Config
  - Zig version   : 0.14.1
  - build mode    : builtin.OptimizeMode.ReleaseFast
  - app runtime   : apprt.Runtime.gtk
  - font engine   : font.main.Backend.fontconfig_freetype
  - renderer      : renderer.generic.Renderer(renderer.OpenGL)
  - libxev        : io_uring
  - kernel version: 6.16.8-arch3-1
  - desktop env   : gnome
  - GTK version   :
    build         : 4.18.6
    runtime       : 4.20.1
  - libadwaita    : enabled
    build         : 1.7.7
    runtime       : 1.8.0
  - libX11        : enabled
  - libwayland    : enabled

OS Version Information

Linux 6.16.8-arch3-1

(Linux only) Display Server

Wayland

(Linux only) Desktop Environment/Window Manager

GNOME Shell 49.0

Minimal Ghostty Configuration

Default

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.
• I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.

[jcollie]

#8944