Update tmux-display-helper with tmux systemd unit

}

if has systemd-run; then

	launch() { systemd-run --scope --user "$@"; }

else

	launch() { setsid "$@"; }

fi

start_client() {

	[ $# -eq 1 ] || bad_arg "start-client takes no arguments"

	[ -z "$TMUX" ] || die "this command must be run from outside of tmux"

	if ! tmux has-session; then

		launch tmux start-server

		if has systemctl; then

			systemctl --user start tmux.service

		else

			setsid tmux start-server

		fi

	fi

	set_var DISPLAY "$DISPLAY"

	tmux attach-session; code=$?