2005-06-12  Morten Welinder  <terra@gnome.org>

	* src/workbook.c (workbook_detach_view): Just dispose of the view.
	That will both break cycles and indirectly unref.
	(workbook_sheet_delete): Ditto.

	* src/workbook-view.c (wb_view_sheet_add): Don't leak a ref to the
	new view.

	* src/sheet-view.c (sheet_view_new): Ref the sheet view when we
	add it to the sheet's list of views.
	(sv_real_dispose): Unref as we remove from said list.