views/dazzling: Add cached events to shuffled row

Cached events won't be readded by the backend, because they're
alread present in the view, so we have to manually add them to
the rows.

src/gui/views/gcal-dazzling-month-view.c

@@ -149,6 +149,28 @@ update_active_date (GcalDazzlingMonthView *self)
   g_object_notify (G_OBJECT (self), "active-date");
 }
 
+static void
+add_cached_events_to_row (GcalDazzlingMonthView *self,
+                          GcalMonthViewRow      *row)
+{
+  g_autoptr (GcalRange) row_range = NULL;
+  GHashTableIter iter;
+  GcalEvent *event;
+
+  row_range = gcal_month_view_row_get_range (row);
+
+  g_hash_table_iter_init (&iter, self->events);
+  while (g_hash_table_iter_next (&iter, (gpointer *) &event, NULL))
+    {
+      GcalRangeOverlap overlap = gcal_range_calculate_overlap (row_range, gcal_event_get_range (event), NULL);
+
+      if (overlap == GCAL_RANGE_NO_OVERLAP)
+        continue;
+
+      gcal_month_view_row_add_event (row, event);
+    }
+}
+
 static void
 move_bottom_row_to_top (GcalDazzlingMonthView *self)
 {
@@ -179,6 +201,8 @@ move_bottom_row_to_top (GcalDazzlingMonthView *self)
   last_row = g_ptr_array_steal_index (self->week_rows, self->week_rows->len - 1);
   gcal_month_view_row_set_range (GCAL_MONTH_VIEW_ROW (last_row), new_range);
   g_ptr_array_insert (self->week_rows, 0, last_row);
+
+  add_cached_events_to_row (self, GCAL_MONTH_VIEW_ROW (last_row));
 }
 
 static void
@@ -211,6 +235,8 @@ move_top_row_to_bottom (GcalDazzlingMonthView *self)
   first_row = g_ptr_array_steal_index (self->week_rows, 0);
   gcal_month_view_row_set_range (GCAL_MONTH_VIEW_ROW (first_row), new_range);
   g_ptr_array_insert (self->week_rows, -1, first_row);
+
+  add_cached_events_to_row (self, GCAL_MONTH_VIEW_ROW (first_row));
 }
 
 static inline void