Gets information about the property that this method call is for, if
any.
This will only be set in the case of an invocation in response to a
property Get or Set call that has been directed to the method call
handler for an object on account of its property_get() or
property_set() vtable pointers being unset.
See GDBusInterfaceVTable for more information.
If the call was GetAll, NULL will be returned.
Since 2.38
Gets information about the property that this method call is for, if any. This will only be set in the case of an invocation in response to a property Get or Set call that has been directed to the method call handler for an object on account of its property_get() or property_set() vtable pointers being unset. See GDBusInterfaceVTable for more information. If the call was GetAll, NULL will be returned. Since 2.38