2004-04-04  Sven Neumann  <sven@gimp.org>

	* app/display/gimpdisplayshell-callbacks.c
	* app/display/gimpdisplayshell-draw.[ch] pass the bounding box of
	the exposed area to gimp_display_shell_draw_grid() and draw only
	the relevant part of the grid. Fixes bug #138606.