Created attachment 9360 
Fix inhibitor listing in xfce4-screensaver-command

When adding an inhibitor using e.g. xfce4-screensaver-command -i, xfce4-screensaver-command -q still says that the screensaver is uninhibited:

[m@n:~] xfce4-screensaver-command -i &
[1] 469425
[m@n:~] xfce4-screensaver-command -q
The screensaver is inactive
The screensaver is not inhibited

The screensaver debug log shows inhibitor addition though:

[listener_add_ref_entry] gs-listener-dbus.c:566 (22:56:08.172):	 Adding inhibitor from Unknown for reason 'Unknown' on connection :1.168

It seems, the code for unpacking the dbus query in the command source:

        body = g_dbus_message_get_body (reply);
        g_object_unref (reply);

        if (g_variant_n_children(body) <= 0) {
            g_print (_("The screensaver is not inhibited\n"));
        } else {
            g_variant_get (body, "s", &iter);
            g_print (_("The screensaver is being inhibited by:\n"));
            while (g_variant_iter_loop (iter, "s", &str)) {
                g_print ("\t%s\n", str);
            }
            g_variant_iter_free (iter);
        }

is wrong int two respects:

- unref'ing the reply gobject also invalidates the body extracted from it and
- the iterator is set up with the wrong format string

See attached patch for a fix that works for me. With that patch, the command correctly reports active inhibitors:

[m@n:~/src/xfce4-screensaver] src/xfce4-screensaver-command -i &
[1] 470027
[m@n:~/src/xfce4-screensaver] src/xfce4-screensaver-command -q
The screensaver is inactive
The screensaver is being inhibited by:
	Application="Unknown"; Since="2020-01-08T21:56:08.172222Z"; Reason="Unknown";