manager: pass ECalObjModType to update and remove

Currently, GcalManager always assumes E_CAL_OBJ_MOD_THIS
when modifying or deleting events. Since we're landing
the groundwork for recurrence management, we can't assume
this anymore.

This patch, then, allows GcalManager:modify_event() and
:remove_event() receive the ECalObjModType instead of
assuming E_CAL_OBJ_MOD_THIS. However, this commit does
not add recurrence support yet, and every call to these
functions are still passing E_CAL_OBJ_MOD_THIS.

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

src/gcal-manager.c

@@ -1748,12 +1748,14 @@ gcal_manager_create_event (GcalManager *manager,
  * gcal_manager_update_event:
  * @manager: a #GcalManager
  * @event: a #GcalEvent
+ * @mod: an #ECalObjModType
  *
  * Saves all changes made to @event persistently.
  */
 void
-gcal_manager_update_event (GcalManager *manager,
-                           GcalEvent   *event)
+gcal_manager_update_event (GcalManager    *manager,
+                           GcalEvent      *event,
+                           ECalObjModType  mod)
 {
   GcalManagerUnit *unit;
   ECalComponent *component;
@@ -1775,7 +1777,7 @@ gcal_manager_update_event (GcalManager *manager,
 
   e_cal_client_modify_object (unit->client,
                               e_cal_component_get_icalcomponent (component),
-                              E_CAL_OBJ_MOD_THIS,
+                              mod,
                               NULL,
                               on_event_updated,
                               component);
@@ -1787,12 +1789,14 @@ gcal_manager_update_event (GcalManager *manager,
  * gcal_manager_remove_event:
  * @manager: a #GcalManager
  * @event: a #GcalEvent
+ * @mod: an #ECalObjModType
  *
  * Deletes @event.
  */
 void
-gcal_manager_remove_event (GcalManager *manager,
-                           GcalEvent   *event)
+gcal_manager_remove_event (GcalManager    *manager,
+                           GcalEvent      *event,
+                           ECalObjModType  mod)
 {
   GcalManagerUnit *unit;
   ECalComponentId *id;
@@ -1817,7 +1821,7 @@ gcal_manager_remove_event (GcalManager *manager,
   e_cal_client_remove_object (unit->client,
                               id->uid,
                               id->rid,
-                              E_CAL_OBJ_MOD_THIS,
+                              mod,
                               manager->async_ops,
                               on_event_removed,
                               component);