Convert over to using an GtkInvisible - selections don't work properly

Convert over to using an GtkInvisible - selections don't work properly

Sun Feb 24 23:23:28 2002  Owen Taylor  <otaylor@redhat.com>

	* tests/testselection.c (main): Convert over to using
	an GtkInvisible - selections don't work properly
	with now NO_WINDOW GtkToggleButton. (Example really
	should be using GtkClipboard.)

	* gdk/x11/gdkselection-x11.c (gdk_selection_property_get):
	Fix  problems if sizeof(GdkAtom) != sizeof(Atom). (Unlikely)

	* gdk/x11/gdkproperty-x11.c (gdk_property_get): Set
	actual_length when converting atoms as well.
	(Gregory Merchan, #72074)