GdkMonitor and GdkSeat were missing here.
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkFrameClock, g_object_unref)
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkGLContext, g_object_unref)
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkKeymap, g_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkMonitor, g_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkSeat, g_object_unref)
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkWindow, g_object_unref)
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkContentFormats, gdk_content_formats_unref)