[evolution] I#57 - Edited event time keeps the old instance in the UI

[Milan Crha <mcrha src gnome org>]

commit 3cea6c53337382330c443f50f858424ead2005b6
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jul 24 13:45:29 2018 +0200

    I#57 - Edited event time keeps the old instance in the UI
    
    Closes https://gitlab.gnome.org/GNOME/evolution/issues/57

 src/calendar/gui/e-cal-data-model.c | 71 +++++++++++++++++++++++++++++++++++--
 src/calendar/gui/tag-calendar.c     |  6 ++--
 2 files changed, 71 insertions(+), 6 deletions(-)
---
diff --git a/src/calendar/gui/e-cal-data-model.c b/src/calendar/gui/e-cal-data-model.c
index 9215edbb0a..c43c59eb90 100644
--- a/src/calendar/gui/e-cal-data-model.c
+++ b/src/calendar/gui/e-cal-data-model.c
@@ -606,6 +606,19 @@ cal_data_model_thaw_all_subscribers (ECalDataModel *data_model)
        cal_data_model_foreach_subscriber (data_model, NULL, cal_data_model_thaw_subscriber_cb, NULL);
 }
 
+static void
+cal_data_model_gather_subscribers_cb (ECalDataModel *data_model,
+                                     ECalClient *client,
+                                     ECalDataModelSubscriber *subscriber,
+                                     gpointer user_data)
+{
+       GHashTable *subscribers = user_data;
+
+       g_return_if_fail (subscribers != NULL);
+
+       g_hash_table_insert (subscribers, g_object_ref (subscriber), NULL);
+}
+
 static void
 cal_data_model_add_component_cb (ECalDataModel *data_model,
                                 ECalClient *client,
@@ -793,8 +806,9 @@ cal_data_model_process_added_component (ECalDataModel *data_model,
                                        ComponentData *comp_data,
                                        GHashTable *known_instances)
 {
-       ECalComponentId *id;
+       ECalComponentId *id, *old_id = NULL;
        ComponentData *old_comp_data = NULL;
+       time_t old_instance_start = (time_t) 0, old_instance_end = (time_t) 0;
        gboolean comp_data_equal;
 
        g_return_if_fail (data_model != NULL);
@@ -824,6 +838,12 @@ cal_data_model_process_added_component (ECalDataModel *data_model,
 
        comp_data_equal = component_data_equal (comp_data, old_comp_data);
 
+       if (old_comp_data) {
+               old_id = e_cal_component_get_id (old_comp_data->component);
+               old_instance_start = old_comp_data->instance_start;
+               old_instance_end = old_comp_data->instance_end;
+       }
+
        if (view_data->lost_components)
                g_hash_table_remove (view_data->lost_components, id);
 
@@ -836,17 +856,62 @@ cal_data_model_process_added_component (ECalDataModel *data_model,
        g_hash_table_insert (view_data->components, id, comp_data);
 
        if (!comp_data_equal) {
-               if (!old_comp_data)
+               if (!old_comp_data) {
                        cal_data_model_foreach_subscriber_in_range (data_model, view_data->client,
                                comp_data->instance_start, comp_data->instance_end,
                                cal_data_model_add_component_cb, comp_data->component);
-               else
+               } else if (comp_data->instance_start != old_instance_start ||
+                          comp_data->instance_end != old_instance_end) {
+                       /* Component moved to a different time; some subscribers may lose it,
+                          some may just modify it, some may have it added. */
+                       GHashTable *old_subscribers, *new_subscribers;
+                       GHashTableIter iter;
+                       gpointer key;
+
+                       old_subscribers = g_hash_table_new_full (g_direct_hash, g_direct_equal, 
g_object_unref, NULL);
+                       new_subscribers = g_hash_table_new_full (g_direct_hash, g_direct_equal, 
g_object_unref, NULL);
+
+                       cal_data_model_foreach_subscriber_in_range (data_model, view_data->client,
+                               old_instance_start, old_instance_end,
+                               cal_data_model_gather_subscribers_cb, old_subscribers);
+
+                       cal_data_model_foreach_subscriber_in_range (data_model, view_data->client,
+                               comp_data->instance_start, comp_data->instance_end,
+                               cal_data_model_gather_subscribers_cb, new_subscribers);
+
+                       g_hash_table_iter_init (&iter, old_subscribers);
+                       while (g_hash_table_iter_next (&iter, &key, NULL)) {
+                               ECalDataModelSubscriber *subscriber = key;
+
+                               /* If in both hashes, then the subscriber can be notified with 'modified',
+                                  otherwise the component had been 'removed' for it. */
+                               if (g_hash_table_remove (new_subscribers, subscriber))
+                                       e_cal_data_model_subscriber_component_modified (subscriber, 
view_data->client, comp_data->component);
+                               else if (old_id)
+                                       e_cal_data_model_subscriber_component_removed (subscriber, 
view_data->client, old_id->uid, old_id->rid);
+                       }
+
+                       /* Those which left in the new_subscribers have the component added. */
+                       g_hash_table_iter_init (&iter, new_subscribers);
+                       while (g_hash_table_iter_next (&iter, &key, NULL)) {
+                               ECalDataModelSubscriber *subscriber = key;
+
+                               e_cal_data_model_subscriber_component_added (subscriber, view_data->client, 
comp_data->component);
+                       }
+
+                       g_hash_table_destroy (old_subscribers);
+                       g_hash_table_destroy (new_subscribers);
+               } else {
                        cal_data_model_foreach_subscriber_in_range (data_model, view_data->client,
                                comp_data->instance_start, comp_data->instance_end,
                                cal_data_model_modify_component_cb, comp_data->component);
+               }
        }
 
        view_data_unlock (view_data);
+
+       if (old_id)
+               e_cal_component_free_id (old_id);
 }
 
 typedef struct _GatherComponentsData {
diff --git a/src/calendar/gui/tag-calendar.c b/src/calendar/gui/tag-calendar.c
index 652abe0df7..1227c38d9c 100644
--- a/src/calendar/gui/tag-calendar.c
+++ b/src/calendar/gui/tag-calendar.c
@@ -493,7 +493,7 @@ e_tag_calendar_data_subscriber_component_added (ECalDataModelSubscriber *subscri
 
        e_tag_calendar_update_component_dates (tag_calendar, NULL, oinfo);
 
-       g_hash_table_insert (tag_calendar->priv->objects, oinfo, GINT_TO_POINTER (0));
+       g_hash_table_replace (tag_calendar->priv->objects, oinfo, NULL);
 }
 
 static void
@@ -537,7 +537,7 @@ e_tag_calendar_data_subscriber_component_modified (ECalDataModelSubscriber *subs
        e_tag_calendar_update_component_dates (tag_calendar, old_oinfo, new_oinfo);
 
        /* it also frees old_oinfo */
-       g_hash_table_insert (tag_calendar->priv->objects, new_oinfo, GINT_TO_POINTER (0));
+       g_hash_table_replace (tag_calendar->priv->objects, new_oinfo, NULL);
 }
 
 static void
@@ -773,7 +773,7 @@ e_tag_calendar_init (ETagCalendar *tag_calendar)
                object_info_hash,
                object_info_equal,
                object_info_free,
-               g_free);
+               NULL);
 
        tag_calendar->priv->dates = g_hash_table_new_full (
                g_direct_hash,