month-view: Ignore events outside current range

The month view looks specially awful when switching between
dates, since it doesn't implicitly filter the ranges it's
displaying.

Ignore events outside the current month range, since they'll
be removed anyway by the timeline.

src/views/gcal-month-view.c

@@ -573,6 +573,16 @@ get_real_event_widget_height (GtkWidget *widget)
   return min_height;
 }
 
+static inline gboolean
+month_view_contains_event (GcalRange *month_range,
+                           GcalEvent *event)
+{
+  GcalRangeOverlap overlap;
+
+  overlap = gcal_range_calculate_overlap (month_range, gcal_event_get_range (event), NULL);
+  return overlap != GCAL_RANGE_NO_OVERLAP;
+}
+
 static void
 allocate_multiday_events (GcalMonthView *self,
                           gdouble       *vertical_cell_space,
@@ -580,12 +590,14 @@ allocate_multiday_events (GcalMonthView *self,
                           gint          *events_at_day,
                           gint          *allocated_events_at_day)
 {
+  g_autoptr (GcalRange) month_range = NULL;
   GtkAllocation event_allocation;
   GtkBorder margin;
   GList *l;
   gboolean is_rtl;
 
   is_rtl = gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL;
+  month_range = gcal_timeline_subscriber_get_range (GCAL_TIMELINE_SUBSCRIBER (self));
 
   for (l = self->multi_cell_children; l; l = g_list_next (l))
     {
@@ -603,6 +615,9 @@ allocate_multiday_events (GcalMonthView *self,
       event = gcal_event_widget_get_event (l->data);
       child_context = gtk_widget_get_style_context (l->data);
 
+      if (!month_view_contains_event (month_range, event))
+        continue;
+
       /*
        * Multiday events can "break" following these rules:
        *
@@ -744,12 +759,15 @@ allocate_single_day_events (GcalMonthView *self,
                             gint          *events_at_day,
                             gint          *allocated_events_at_day)
 {
+  g_autoptr (GcalRange) month_range = NULL;
   GHashTableIter iter;
   GtkAllocation event_allocation;
   GtkAllocation cell_allocation;
   GtkBorder margin;
   gpointer key, value;
 
+  month_range = gcal_timeline_subscriber_get_range (GCAL_TIMELINE_SUBSCRIBER (self));
+
   g_hash_table_iter_init (&iter, self->single_cell_children);
 
   while (g_hash_table_iter_next (&iter, &key, &value))
@@ -770,6 +788,7 @@ allocate_single_day_events (GcalMonthView *self,
       l = (GList*) value;
       for (aux = l; aux; aux = g_list_next (aux))
         {
+          GcalEvent *event;
           GtkStyleContext *child_context;
           GtkWidget *child_widget;
           gdouble real_height;
@@ -780,10 +799,14 @@ allocate_single_day_events (GcalMonthView *self,
           gint minimum_height;
 
           child_widget = aux->data;
+          event = gcal_event_widget_get_event (GCAL_EVENT_WIDGET (child_widget));
 
           if (!gtk_widget_get_visible (child_widget))
             continue;
 
+          if (!month_view_contains_event (month_range, event))
+            continue;
+
           child_context = gtk_widget_get_style_context (child_widget);
 
           gtk_style_context_get_margin (child_context, gtk_style_context_get_state (child_context), &margin);