* libnautilus-private/nautilus-thumbnails.c:
	(pixel_matches_value): Simplify logic.
	(pixbuf_is_framed): Do size and format reality checks on pixbuf
	before reading the pixels.
	(nautilus_thumbnail_load_framed_image): Handle case where the
	pixbuf loading failed. Handle case where there's no frame. Handle
	case where the frame offsets in the theme data is improperly
	formatted.