2006-12-28  Morten Welinder  <terra@gnome.org>

	* src/sheet-object-graph.c (gnm_sog_foreach_dep): New function.

	* src/sheet-object-widget.c (sheet_widget_adjustment_foreach_dep,
	sheet_widget_checkbox_foreach_dep,
	sheet_widget_radio_button_foreach_dep,
	sheet_widget_list_base_foreach_dep): New functions.

	* src/sheet-object.c (sheet_object_invalidate_sheet): Reimplement
	in terms of sheet_object_foreach_dep.
	(sheet_object_foreach_dep): New function.
	(sheet_objects_dup): Fixup references to source sheet. Fixes
	#158825.