[gnome-calendar/gnome-3-36] year-view: Clone and modify new event when dropping

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 286154525443bf7e2fddd8f29a89e9ea4d63ecda
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Jun 15 13:32:02 2020 -0300

    year-view: Clone and modify new event when dropping
    
    Pretty much the same rationale and implementation of the previous
    commit.

 src/views/gcal-year-view.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)
---
diff --git a/src/views/gcal-year-view.c b/src/views/gcal-year-view.c
index 76f875e6..bc7f38a5 100644
--- a/src/views/gcal-year-view.c
+++ b/src/views/gcal-year-view.c
@@ -1485,6 +1485,7 @@ navigator_drag_drop_cb (GcalYearView   *self,
 
       if (!is_title)
         {
+          g_autoptr (GcalEvent) changed_event = NULL;
           GcalRecurrenceModType mod;
           GcalEventWidget *event_widget;
           GcalCalendar *calendar;
@@ -1494,17 +1495,18 @@ navigator_drag_drop_cb (GcalYearView   *self,
 
           event_widget = GCAL_EVENT_WIDGET (gtk_drag_get_source_widget (context));
           event = gcal_event_widget_get_event (event_widget);
-          calendar = gcal_event_get_calendar (event);
+          changed_event = gcal_event_new_from_event (event);
+          calendar = gcal_event_get_calendar (changed_event);
           mod = GCAL_RECURRENCE_MOD_THIS_ONLY;
 
-          if (gcal_event_has_recurrence (event) &&
+          if (gcal_event_has_recurrence (changed_event) &&
               !ask_recurrence_modification_type (GTK_WIDGET (self), &mod, calendar))
             {
               goto out;
             }
 
-          start_dt = gcal_event_get_date_start (event);
-          end_dt = gcal_event_get_date_end (event);
+          start_dt = gcal_event_get_date_start (changed_event);
+          end_dt = gcal_event_get_date_end (changed_event);
 
           drop_date = g_date_time_add_full (start_dt,
                                             g_date_time_get_year (self->date) - g_date_time_get_year 
(start_dt),
@@ -1518,7 +1520,7 @@ navigator_drag_drop_cb (GcalYearView   *self,
               GDateTime *new_start;
 
               new_start = g_date_time_add (start_dt, diff);
-              gcal_event_set_date_start (event, new_start);
+              gcal_event_set_date_start (changed_event, new_start);
 
               /* The event may have a NULL end date, so we have to check it here */
               if (end_dt)
@@ -1526,12 +1528,14 @@ navigator_drag_drop_cb (GcalYearView   *self,
                   GDateTime *new_end;
 
                   new_end = g_date_time_add (end_dt, diff);
-                  gcal_event_set_date_end (event, new_end);
+                  gcal_event_set_date_end (changed_event, new_end);
 
                   g_clear_pointer (&new_end, g_date_time_unref);
                 }
 
-              gcal_manager_update_event (gcal_context_get_manager (self->context), event, mod);
+              gcal_manager_update_event (gcal_context_get_manager (self->context),
+                                         changed_event,
+                                         mod);
 
               g_clear_pointer (&new_start, g_date_time_unref);
             }