The source project of this merge request has been removed.
xfce-spawn: Do not change DISPLAY on non-X11 displays
xfce_spawn_process sets the DISPLAY environment variable according to gdk_screen_make_display_name (screen), but gdk_screen_make_display_name only returns an X11 display name on X11 environments, so the DISPLAY environment variable gets set to the wrong value for non-X11 environments.
In particular, for Wayland, it returns WAYLAND_DISPLAY, so DISPLAY gets overridden to WAYLAND_DISPLAY, which breaks spawning X11 applications on XWayland setups (e.g. when launching from Thunar custom actions).
Only set DISPLAY on X11 displays, and otherwise leave DISPLAY as-is.
Original patch by Andre Miranda, misc. cleanups by me.
Fixes: #13 (closed)