gtk: window border is not removed if `window-decoration` is `false` · Issue #2023 · ghostty-org/ghostty
github.com
On current main (4cf6202) window border is not removed with window-decoration=false but it is removed with gtk-titlebar=false. I've bisected the behavior change to 2d7baaa (i.e. #1950). As document...

I found the following Ghostty config can be used to get i3wm border around Ghostty (using i3wm with XFCE)

window-decoration = true
gtk-titlebar = false
gtk-adwaita = false

Related: With the release of 1.0.1 of Ghostty, there is an issue with border around Ghostty on Linux