Ignore false GSettings key change notifications

Similar to GObject::notify, the GSettings::changed can be emitted
even if a key didn't change. It's up to the user (aka evolution)
to test for real changes, thus let's do it. It may have certain
performance positive impact too.

1 files changed, 7 insertions, 2 deletions

diff --git a/calendar/gui/e-day-view-time-item.c b/calendar/gui/e-day-view-time-item.c
index f85b09eebd..b30951bb5b 100644
--- a/calendar/gui/e-day-view-time-item.c
+++ b/calendar/gui/e-day-view-time-item.c
@@ -727,16 +727,21 @@ edvti_second_zone_changed_cb (GSettings *settings,
 {
 	EDayViewTimeItem *time_item = user_data;
 	EDayView *day_view;
+	icaltimezone *second_zone;
 	gchar *location;
 
 	g_return_if_fail (user_data != NULL);
 	g_return_if_fail (E_IS_DAY_VIEW_TIME_ITEM (time_item));
 
 	location = calendar_config_get_day_second_zone ();
-	time_item->priv->second_zone =
-		location ? icaltimezone_get_builtin_timezone (location) : NULL;
+	second_zone = location ? icaltimezone_get_builtin_timezone (location) : NULL;
 	g_free (location);
 
+	if (second_zone == time_item->priv->second_zone)
+		return;
+
+	time_item->priv->second_zone = second_zone;
+
 	day_view = e_day_view_time_item_get_day_view (time_item);
 	gtk_widget_set_size_request (
 		day_view->time_canvas,