[banshee] NotificationArea: play notification on Gnome Lockscreen (bgo#733517)

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 3cc3ee064d9d9c7c66f7a17b0c24b1dcf2937205
Author: Samuel Gyger <samuel gyger at>
Date:   Tue Jul 22 02:55:58 2014 +0200

    NotificationArea: play notification on Gnome Lockscreen (bgo#733517)
    
    Signed-off-by: Andrés G. Aragoneses <knocte gmail com>

 data/desktop-files/common.desktop.in               |    1 +
 .../NotificationAreaService.cs                     |    4 ++++
 2 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/data/desktop-files/common.desktop.in b/data/desktop-files/common.desktop.in
index 505d747..edbdd70 100644
--- a/data/desktop-files/common.desktop.in
+++ b/data/desktop-files/common.desktop.in
@@ -13,3 +13,4 @@ X-GNOME-Bugzilla-Bugzilla=GNOME
 X-GNOME-Bugzilla-Product=banshee
 X-GNOME-Bugzilla-Component=General
 X-GNOME-Bugzilla-Version= VERSION@
+X-GNOME-UsesNotifications=true
diff --git a/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/NotificationAreaService.cs 
b/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/NotificationAreaService.cs
index 3e47a55..b9f393d 100644
--- a/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/NotificationAreaService.cs
+++ b/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/NotificationAreaService.cs
@@ -500,6 +500,10 @@ namespace Banshee.NotificationArea
                     current_nf.AddHint ("image-path", image);
                 }
 
+                if (ServiceManager.PlayerEngine.IsPlaying ()) {
+                    current_nf.Category = "x-gnome.music";
+                }
+
                 if (PersistenceSupported) {
                     current_nf.AddHint ("resident", true);
                 }