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
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With version 1.1.0, the mentioned config for ghostty does not show i3wm border around ghostty.
get the border around ghostty
1.1.2
in i3wm using the following configgtk-adwaita = true gtk-titlebar = false window-decoration = server