gdk3 test: Gdk::Window and Gdk::Pixbuf module are not defined.
gdk3 test: Gdk::Window and Gdk::Pixbuf module are not defined.

Currently, Gdk.default_root_window and Gdk.pixbuf_get_from_surface are
defined unexpectedly.

kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2