---

    # Fix exchange contacts tracking, upstream bug #546934
    #epatch "${FILESDIR}"/${P}-exchange-contact.patch


At http://bugzilla.gnome.org/show_bug.cgi?id=546934

e_book_backend_exchange_get_changes() (and therefore e_book_get_changes() with
an Exchange address book) has three different problems:

* The list of collected changes in ctx->changes is never returned to the caller.
  Instead the list is leaked when freeing the context.
* For deleted items, an empty vcard with the UID set should be returned.
  Instead find_deleted_ids() stores the UID directly.
* find_deleted_ids() is a callback for g_hash_table_foreach() and modifies
  the hash that is iterated over. That's a big no-no! The effect is that the
  iteration is stopped prematurely, leading to incorrect change tracking.
  g_hash_table_foreach_remove() and its XML wrapper function have to be used
  instead.

Index: addressbook/e-book-backend-exchange.c
===================================================================
--- addressbook/e-book-backend-exchange.c	(revision 1709)
+++ addressbook/e-book-backend-exchange.c	(working copy)
@@ -2042,17 +2042,29 @@
 	CORBA_free (change);
 }
 
-static void
+static gboolean
 find_deleted_ids (const char *id, const char *vcard, gpointer user_data)
 {
 	EBookBackendExchangeChangeContext *ctx = user_data;
+	gboolean remove = FALSE;
 
 	if (!g_hash_table_lookup (ctx->seen_ids, id)) {
-		ctx->changes = g_list_prepend (
-			ctx->changes,
-			e_book_backend_change_delete_new (id));
-		e_xmlhash_remove (ctx->ehash, id);
+		char *vcard = NULL;
+		EContact *contact = e_contact_new ();
+		if (contact) {
+			e_contact_set (contact, E_CONTACT_UID, id);
+			vcard = e_vcard_to_string (E_VCARD (contact), EVC_FORMAT_VCARD_30);
+			if (vcard) {
+				ctx->changes = g_list_prepend (
+							       ctx->changes,
+							       e_book_backend_change_delete_new (vcard));
+				g_free (vcard);
+			}
+			g_object_unref (contact);
+		}
+		remove = TRUE;
 	}
+	return remove;
 }
 
 static EBookBackendSyncStatus
@@ -2135,9 +2147,14 @@
 			g_list_foreach (ctx->changes, free_change, NULL);
 			ctx->changes = NULL;
 		} else {
-			e_xmlhash_foreach_key (ctx->ehash, find_deleted_ids, ctx);
+			e_xmlhash_foreach_key_remove (ctx->ehash, find_deleted_ids, ctx);
 			e_xmlhash_write (ctx->ehash);
 		}
+
+		/* transfer ownership of result to caller before cleaning up */
+		*changes = ctx->changes;
+		ctx->changes = NULL;
+
   		e_xmlhash_destroy (ctx->ehash);
 		g_hash_table_destroy (ctx->seen_ids);
 		g_free (ctx);