`gdbus monitor` doesn't monitor method calls
Next to listing emitted signals, dbus-monitor
also knows (and prints) when methods are called on an object.
gdbus monitor
only lists emitted signals, but does not know the latter. This would be a useful feature, especially since dbus-monitor has issues (for example, not returning the method call return value).
I don't know if this is in scope of gdbus monitor
, but if it's not, we should at least mention in the manpage that this is the case.