## Summary

On my Omarchy install, the terminal keybind launches Ghostty through `xdg-terminal-exec`. That uses the Ghostty desktop file, which launches Ghostty with `--gtk-single-instance=true`.

When I run OpenCode inside tmux from a Ghostty window opened this way, Ghostty can crash. Because it is single-instance mode, all Ghostty windows from that shared process can close.

If I launch Ghostty by typing `ghostty` in another terminal, the same OpenCode plus tmux flow does not crash.

## What I expected

The terminal keybind should launch Ghostty the same way as typing `ghostty`, or at least should not force a mode that can take down every Ghostty window when one surface crashes.

## What happened

The keybind path launches:

```text
/usr/bin/ghostty --gtk-single-instance=true
```

Typing `ghostty` launches:

```text
/usr/bin/ghostty
```

The `--gtk-single-instance=true` path is the one that crashes all shared Ghostty windows for me.

## Reproduction

On Omarchy with Ghostty as the default terminal:

1. Press the terminal keybind.
2. Run:

```bash
tmux
opencode
```

3. Interact with OpenCode.
4. Ghostty can crash. In single-instance mode, other Ghostty windows from the same process can close too.

Direct launch works:

```bash
ghostty
```

Then:

```bash
tmux
opencode
```

This does not crash for me.

## Evidence

Omarchy keybind uses `xdg-terminal-exec`:

```text
$terminal = uwsm-app -- xdg-terminal-exec
bindd = SUPER, BACKSPACE, Terminal, exec, $terminal --working-directory="$(omarchy-cmd-terminal-cwd)"
```

`xdg-terminal-exec --print-cmd` returns:

```text
/usr/bin/ghostty
--gtk-single-instance=true
```

The selected desktop file is:

```text
/usr/share/applications/com.mitchellh.ghostty.desktop
```

It has:

```text
Exec=/usr/bin/ghostty --gtk-single-instance=true
```

## Local workaround

I added a user desktop file override:

```text
~/.local/share/applications/com.mitchellh.ghostty.desktop
```

With:

```text
Exec=/usr/bin/ghostty
DBusActivatable=false
```

After that, `xdg-terminal-exec --print-cmd` returns:

```text
/usr/bin/ghostty
```

Now the terminal keybind works and the OpenCode plus tmux flow is stable.

## Versions

```text
Omarchy on Arch Linux
Hyprland on Wayland
Ghostty 1.3.1-arch2
tmux 3.6a
OpenCode 1.14.25
```

## Related

I also opened a Ghostty discussion because Ghostty should not segfault either:

https://github.com/ghostty-org/ghostty/discussions/12460