gdk_gc_get_values (sheet->fg_gc, &auxvalues);
values.foreground = widget->style->white;
values.function = GDK_INVERT;
values.subwindow_mode = GDK_INCLUDE_INFERIORS;
if (sheet->xor_gc)
gdk_gc_get_values (sheet->fg_gc, &auxvalues);
values.foreground = widget->style->white;
values.function = GDK_INVERT;
values.subwindow_mode = GDK_INCLUDE_INFERIORS;
if (sheet->xor_gc)