[gnome-calendar/868-month-view-clicking-date-outside-of-month-in-agenda-list-makes-months-out-of-sync] gcal-date-chooser: Update also `combined_choice` in set_date()

[Milan Crha <mcrha src gnome org>]

commit 74bfba59014040e1215d2dfc11a727b34a6cb531
Author: Milan Crha <mcrha redhat com>
Date:   Wed Oct 5 17:02:28 2022 +0200

    gcal-date-chooser: Update also `combined_choice` in set_date()
    
    Thus it's in sync with the rest of the date chooser.
    
    Also use a common function to replace `self->date` value.
    
    Related to https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/868

 src/gui/event-editor/gcal-date-chooser.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/gui/event-editor/gcal-date-chooser.c b/src/gui/event-editor/gcal-date-chooser.c
index 2c0cd39f..af12b6bd 100644
--- a/src/gui/event-editor/gcal-date-chooser.c
+++ b/src/gui/event-editor/gcal-date-chooser.c
@@ -466,13 +466,13 @@ gcal_date_chooser_set_date (GcalView  *view,
   g_date_time_get_ymd (self->date, &y1, &m1, &d1);
   g_date_time_get_ymd (date, &y2, &m2, &d2);
 
-  g_date_time_unref (self->date);
-  self->date = g_date_time_ref (date);
+  gcal_set_date_time (&self->date, date);
 
   if (y1 != y2 || m1 != m2)
     {
       gcal_multi_choice_set_value (GCAL_MULTI_CHOICE (self->year_choice), y2);
       gcal_multi_choice_set_value (GCAL_MULTI_CHOICE (self->month_choice), m2 - 1);
+      gcal_multi_choice_set_value (GCAL_MULTI_CHOICE (self->combined_choice), y2 * 12 + m2 - 1);
       calendar_compute_days (self);
       gcal_timeline_subscriber_range_changed (GCAL_TIMELINE_SUBSCRIBER (self));
     }