Only call an event listener once per event

If an event listener is registered for an event more than once (ie,
registering both the event and its superset), then only notify it once.

1 files changed, 13 insertions, 0 deletions

diff --git a/atspi/atspi-event-listener.c b/atspi/atspi-event-listener.c
index 26f1105d..ba5d1262 100644
--- a/atspi/atspi-event-listener.c
+++ b/atspi/atspi-event-listener.c
@@ -788,6 +788,7 @@ _atspi_send_event (AtspiEvent *e)
 {
   char *category, *name, *detail;
   GList *l;
+  GList *called_listeners = NULL;
 
   /* Ensure that the value is set to avoid a Python exception */
   /* TODO: Figure out how to do this without using a private field */
@@ -809,12 +810,24 @@ _atspi_send_event (AtspiEvent *e)
         (entry->name == NULL || !strcmp (name, entry->name)) &&
         detail_matches_listener (detail, entry->detail))
     {
+      GList *l2;
+      for (l2 = called_listeners; l2; l2 = l2->next)
+      {
+        EventListenerEntry *e2 = l2->data;
+        if (entry->callback == e2->callback && entry->user_data == e2->user_data)
+          break;
+      }
+      if (!l2)
+      {
         entry->callback (atspi_event_copy (e), entry->user_data);
+        called_listeners = g_list_prepend (called_listeners, entry);
+      }
     }
   }
   if (detail) g_free (detail);
   g_free (name);
   g_free (category);
+  g_list_free (called_listeners);
 }
 
 DBusHandlerResult