Why would chaining gamemoderun make mangohud work in a game?
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$HOME/.config/environment.d/99-mangohud.conf with MANGOHUD=1 and reboot.$HOME/.config/MangoHud/MangoHud.conf and uncomment no_display to make it not show up unless you toggle it in game with Right Shift-F12MANGOHUD=1 %command% in the launch optionscat $(which mangohud)$HOME/.config/environment.d/99-mangohud.confMANGOHUD=1$HOME/.config/MangoHud/MangoHud.confno_displayRight ShiftMANGOHUD=1 %command%cat $(which mangohud)