GDBusObjectManagerClientClass.interfaceProxyPropertiesChanged

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
struct GDBusObjectManagerClientClass
extern (C)
void function(GDBusObjectManagerClient* manager, GDBusObjectProxy* objectProxy, GDBusProxy* interfaceProxy, GVariant* changedProperties, char** invalidatedProperties) interfaceProxyPropertiesChanged;

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