[gnome-shell] telepathyClient: Check for a no-op before pushing an alias change message

[Jasper St. Pierre <jstpierre src gnome org>]

commit d862c0879b1fe3dffaa2a993340dd42c216b31b4
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Oct 3 14:48:49 2011 -0400

    telepathyClient: Check for a no-op before pushing an alias change message
    
    tp-glib can sometimes emit a notify::alias signal when the alias doesn't
    actually change. Bail out early instead of pushing an alias change message.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=660774

 js/ui/telepathyClient.js |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/js/ui/telepathyClient.js b/js/ui/telepathyClient.js
index 0ea3a7e..a0a5823 100644
--- a/js/ui/telepathyClient.js
+++ b/js/ui/telepathyClient.js
@@ -539,9 +539,13 @@ ChatSource.prototype = {
 
     _updateAlias: function() {
         let oldAlias = this.title;
-        this.setTitle(this._contact.get_alias());
-        this._notification.appendAliasChange(oldAlias, this.title);
-        this.pushNotification(this._notification);
+        let newAlias = this._contact.get_alias();
+
+        if (oldAlias == newAlias)
+            return;
+
+        this.setTitle(newAlias);
+        this._notification.appendAliasChange(oldAlias, newAlias);
     },
 
     createNotificationIcon: function() {