#!/bin/bash

function has_active_window {
    xprop -root -f _NET_ACTIVE_WINDOW 32c ' $0\n' _NET_ACTIVE_WINDOW | awk '{ exit $2 == 0 }'
}

while true; do
    if ! has_active_window; then
        xdotool search --onlyvisible --class xfdesktop windowfocus
    fi
    sleep 5
done &> /dev/null