2008-04-10  Vincent Untz  <vuntz@gnome.org>

	Do not create lots of new ClockLocation everytime we load the locations
	from gconf, and try to re-use the old ones.
	As a side-effect, it fixes a bug where you need to click twice on Set
	to set the current location from a different timezone.

	* clock-location.[ch]: (clock_location_find_and_ref): new, find a
	ClockLocation if it already exists, and ref it
	(clock_location_make_current): do not do anything if the location is
	already the current one
	* clock.c: (location_start_element): try to find the location among
	existing ones first, and then fallback on creating a new one
	(run_prefs_edit_save): do not explicitly call locations_changed(), it
	will be done later via gconf notification
	(remove_tree_row): ditto

svn path=/trunk/; revision=11047