Filters signals by iface name.

    :param function f: function to wrap.
    :param str signal_iface_name: interface name.

def filter_properties_signals(f, signal_iface_name):
    """Filters signals by iface name.

    :param function f: function to wrap.
    :param str signal_iface_name: interface name.
    """
    @wraps(f)
    def wrapper(iface, changed_props, invalidated_props, *args, **kwargs):
        if iface == signal_iface_name:
            f(changed_props, invalidated_props)

    return wrapper