Iterate user table in a sorted way, fix tests with latest glib

This is primarily to help test cases which assume that the adopted algorithm
prioritizes the users in the exact order they appear in the test cases (and get
inserted into the session in that order). With older glib version, the five
users being inserted into the user table hash table by the tests happened to
retain the order. With latest glib, due to a minor tweak in hashing strategy,
the order of iteration is different from the order of insertion failing the
tests.

In addition, GHashTable makes no guarantees about the stability of items when
iterating multiple times. Since the algorithm is sensitive to order of users, it
is best to return users in an order that is consistent over multiple calls and
stable over insert/remove operations.

This patch sorts the keys during iteration of users in the user table.

Closes: gobby#22.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>

libinfinity/common/inf-user-table.c

@@ -179,6 +179,13 @@ inf_user_table_lookup_user_by_name_func(gpointer key,
   return FALSE;
 }
 
+static gint
+inf_user_id_list_sort_compare_func(gconstpointer a,
+                                   gconstpointer b)
+{
+  return GPOINTER_TO_UINT(a) - GPOINTER_TO_UINT(b);
+}
+
 static void
 inf_user_table_foreach_user_func(gpointer key,
                                  gpointer value,
@@ -647,6 +654,11 @@ inf_user_table_foreach_user(InfUserTable* user_table,
 {
   InfUserTablePrivate* priv;
   InfUserTableForeachUserData data;
+  GList* user_id_list;
+  GList* item;
+  InfUser* user;
+
+  guint user_id;
 
   g_return_if_fail(INF_IS_USER_TABLE(user_table));
   g_return_if_fail(func != NULL);
@@ -656,11 +668,15 @@ inf_user_table_foreach_user(InfUserTable* user_table,
   data.func = func;
   data.user_data = user_data;
 
-  g_hash_table_foreach(
-    priv->table,
-    inf_user_table_foreach_user_func,
-    &data
-  );
+  user_id_list = g_hash_table_get_keys(priv->table);
+  user_id_list = g_list_sort(user_id_list, inf_user_id_list_sort_compare_func);
+  for(item = user_id_list; item != NULL; item = g_list_next(item))
+  {
+    user_id = GPOINTER_TO_UINT(item->data);
+    user = inf_user_table_lookup_user_by_id(user_table, user_id);
+    func(user, user_data);
+  }
+  g_list_free(user_id_list);
 }
 
 /**