2004-09-02  Sven Neumann  <sven@gimp.org>

	* app/display/gimpdisplayshell-render.c (check_combos): light and
	dark check color were swapped for GIMP_CHECK_TYPE_GRAY_CHECKS.

	* libgimpwidgets/gimppreviewarea.[ch]: added "check-size" and
	"check-type" properties and draw the checkerboard accordingly.