Fix tracking of single-process multi app cases

When starting oocalc or ooimpress from oowriter's menu get_app_for_window,
fails to recognize the newly started up as such, which result into the appMenu
still showing "Openoffice.org Writer" as app name.

Fix this by trying to window itself first before using the group for finding the app.

https://bugzilla.gnome.org/show_bug.cgi?id=611288

src/shell-window-tracker.c

@@ -345,6 +345,19 @@ get_app_for_window (ShellWindowTracker    *monitor,
   MetaGroup *group;
   GSList *iter;
 
+  result = NULL;
+  if (meta_window_get_window_type (window) == META_WINDOW_NORMAL)
+    {
+      result = g_hash_table_lookup (monitor->window_to_app, window);
+      if (result != NULL)
+        {
+          g_object_ref (result);
+          return result;
+        }
+      else
+        return get_app_for_window_direct (window);
+    }
+
   group = meta_window_get_group (window);
   if (group == NULL)
     group_windows = g_slist_prepend (NULL, window);