Change copy_area => !set_bg. Use tile instead of gdk_window_copy_area when

Change copy_area => !set_bg. Use tile instead of gdk_window_copy_area when

Thu Jan 14 20:29:16 1999  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkstyle.[ch] (gtk_style_apply_default_background):
	Change copy_area => !set_bg. Use tile instead of
	gdk_window_copy_area when drawing without !set_bg.

	This does mess up timj's neat check-button example,
	but is consistent with how we interpret background
	pixmaps everywhere else in the default scheme.

	Restructure code for clarity.