_portprotonqt() {
    local cur prev
    _init_completion || return

    case $prev in
        --help|-h)
            return
            ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '--fullscreen --session' -- "$cur" ) )
        return 0
    fi

    return 0
}

complete -F _portprotonqt portprotonqt