* gdl/gdl-dock-bar.c: (on_dock_item_foreach_disconnect),
	(gdl_dock_bar_destroy), (gdl_dock_bar_remove_item),
	(gdl_dock_bar_add_item): Removed minimized buttons from dockbar when
	corresponding dockitem is destroyed. Fixes bug #317004 - Crash when
	maximizaing widget that has been already removed

svn path=/trunk/; revision=372