view iface: remove unused will_add_event

ECalDataModelSubscriber interface notify each view only about the events
beloging to the subscribed range so there's no need of checking if the
event widget will be added.
The safety check of not adding the same widget twice its stil being made
on each GtkContainer::add implementation.

src/gcal-month-view.c

@@ -136,9 +136,6 @@ static GtkWidget*     gcal_month_view_get_by_uuid           (GcalView       *vie
 
 static void           gcal_month_view_clear                 (GcalView       *view);
 
-static gboolean       gcal_month_view_will_add_event        (GcalView        *view,
-                                                             GcalEventWidget *event);
-
 G_DEFINE_TYPE_WITH_CODE (GcalMonthView,
                          gcal_month_view,
                          GCAL_TYPE_SUBSCRIBER,
@@ -228,8 +225,6 @@ gcal_view_interface_init (GcalViewIface *iface)
   iface->draw_event = gcal_month_view_draw_event;
   iface->get_by_uuid = gcal_month_view_get_by_uuid;
   iface->clear = gcal_month_view_clear;
-
-  iface->will_add_event = gcal_month_view_will_add_event;
 }
 
 static void
@@ -1338,35 +1333,6 @@ gcal_month_view_clear (GcalView *view)
                          (GtkCallback) gtk_widget_destroy, NULL);
 }
 
-static gboolean
-gcal_month_view_will_add_event (GcalView        *view,
-                                GcalEventWidget *event)
-{
-  GcalMonthViewPrivate *priv;
-
-  icaltimetype *start_date;
-  gboolean is_in_range;
-
-  const gchar* event_uuid;
-
-  g_return_val_if_fail (GCAL_IS_MONTH_VIEW (view), FALSE);
-  priv = gcal_month_view_get_instance_private (GCAL_MONTH_VIEW (view));
-
-  if (priv->date == NULL)
-    return FALSE;
-
-  start_date = gcal_event_widget_get_date (event);
-  is_in_range = (priv->date->month == start_date->month &&
-                 priv->date->year == start_date->year);
-  g_free (start_date);
-
-  if (!is_in_range)
-    return FALSE;
-
-  event_uuid = gcal_event_widget_peek_uuid (event);
-  return !(gcal_month_view_get_by_uuid (view, event_uuid) != NULL);
-}
-
 /* Public API */
 /**
  * gcal_month_view_new: