c_g_dbus_connection_export_action_group

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
guint function(GDBusConnection* connection, gchar* objectPath, GActionGroup* actionGroup, GError** error) c_g_dbus_connection_export_action_group;

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