reminders-section: make alarm sound changes persistent

When the alarm sound changes, the change is not updated because
gcal-manager does not see the changes.

We now update the components and make more comparisons so that
it can be seen by gcal-manager

src/gui/event-editor/gcal-alarm-row.c

@@ -46,6 +46,7 @@ enum
 
 enum
 {
+  UPDATE_ALARM,
   REMOVE_ALARM,
   N_SIGNALS,
 };
@@ -250,6 +251,7 @@ on_sound_toggle_changed_cb (GtkToggleButton *button,
   gtk_button_set_icon_name (GTK_BUTTON (self->volume_button),
                             has_sound ? "audio-volume-high-symbolic" : "audio-volume-muted-symbolic");
 
+  g_signal_emit (self, signals[UPDATE_ALARM], 0);
 }
 
 
@@ -332,6 +334,14 @@ gcal_alarm_row_class_init (GcalAlarmRowClass *klass)
                                         g_cclosure_marshal_VOID__VOID,
                                         G_TYPE_NONE,
                                         0);
+  signals[UPDATE_ALARM] = g_signal_new ("update-alarm",
+                                        GCAL_TYPE_ALARM_ROW,
+                                        G_SIGNAL_RUN_LAST,
+                                        0,
+                                        NULL, NULL,
+                                        g_cclosure_marshal_VOID__VOID,
+                                        G_TYPE_NONE,
+                                        0);
 
   gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/calendar/ui/event-editor/gcal-alarm-row.ui");