manager: set 'rid' to NULL when 'All events' chosen

Setting 'rid' to NULL in gcal_manager_update_event()
when 'All events' chosen allows us to modify
All and Future Instances of recurrent events correctly.

https://bugzilla.gnome.org/show_bug.cgi?id=782755

src/gcal-manager.c

@@ -1770,6 +1770,15 @@ gcal_manager_update_event (GcalManager    *manager,
   unit = g_hash_table_lookup (manager->clients, gcal_event_get_source (event));
   component = gcal_event_get_component (event);
 
+  /*
+   * HACK: In Evolution Calendar, a NULL 'rid' is usually associated
+   * with an E_CAL_OBJ_MOD_ALL modtype. Here, we are manually setting
+   * the rid to NULL when modifying a recurrent event with MOD_ALL
+   * modtype.
+   */
+  if (mod == E_CAL_OBJ_MOD_ALL)
+    e_cal_component_set_recurid (component, NULL);
+
   /*
    * While we're updating the event, we don't want the component
    * to be destroyed, so take a reference of the component while