Steam/Proton titles run under XWayland with WM_CLASS steam_app_<appid>.
Without a rule they open tiled on whatever monitor Steam is on (the
primary, bottom-left HDMI-A-1). Match steam_app_.* and send them
fullscreen to workspace 6 (DP-1, top-left). Native games use their own
class and can be added individually.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Miguel Palhas
e4b96ba019