Getting _GTK_FRAME_EXTENTS

    auto windowId = X11Wrapper::getActiveWindowId();
    auto windowRect = X11Wrapper::getWindowRect(windowId);

    auto connection = QX11Info::connection();

    xcb_get_property_cookie_t cookie;
    xcb_get_property_reply_t *reply;
    xcb_intern_atom_cookie_t atom_cookie;
    xcb_intern_atom_reply_t *atom_reply;

    atom_cookie = xcb_intern_atom(connection, 0, strlen("_GTK_FRAME_EXTENTS"), "_GTK_FRAME_EXTENTS");

    if ((atom_reply = xcb_intern_atom_reply(connection, atom_cookie, nullptr))) {
        printf("The _GTK_FRAME_EXTENTS atom has ID %u\n", atom_reply->atom);
    }

    cookie = xcb_get_property(connection, 0, windowId, atom_reply->atom, XCB_ATOM_CARDINAL, 0, 4);

    qDebug("Checking reply");
    if ((reply = xcb_get_property_reply(connection, cookie, nullptr))) {
        int len = xcb_get_property_value_length(reply);
        if (len == 0) {
            printf("Length zero\n");
        } else {
            printf("_GTK_FRAME_EXTENTS is %.*s\n", len, (char*)xcb_get_property_value(reply));
        }
    }
    free(reply);
    free(atom_reply);