[gnome-shell] TelepathyClient: fix ackowledging chat messages

[Giovanni Campagna <gcampagna src gnome org>]

commit 934ec3c3fe34ec5f13e5395c1d7a1da8356b1747
Author: Giovanni Campagna <gcampagna gnome org>
Date:   Tue Mar 17 13:06:51 2015 -0700

    TelepathyClient: fix ackowledging chat messages
    
    ChatSource relies on the 'expanded' signal on the banner to
    ack messages, but no code ever emits that.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=746364

 js/ui/calendar.js |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/calendar.js b/js/ui/calendar.js
index a79fd7e..38263e5 100644
--- a/js/ui/calendar.js
+++ b/js/ui/calendar.js
@@ -1106,6 +1106,8 @@ const Message = new Lang.Class({
             this._bodyStack.layout_manager.expansion = 1;
             this._actionBin.scale_y = 1;
         }
+
+        this.emit('expanded');
     },
 
     unexpand: function(animate) {
@@ -1128,6 +1130,8 @@ const Message = new Lang.Class({
             this._actionBin.scale_y = 0;
             this.expanded = false;
         }
+
+        this.emit('unexpanded');
     },
 
     canClose: function() {