[banshee] [TrackInfoDisplay] Fix a memory leak (bgo#555365)

[Alexander Kojevnikov <alexk src gnome org>]

commit cdb50891b60cd0fbb4cf2b8dba9cd4f9c46a7f29
Author: Bertrand Lorentz <bertrand lorentz gmail com>
Date:   Wed Feb 10 09:46:30 2010 +1100

    [TrackInfoDisplay] Fix a memory leak (bgo#555365)
    
    Signed-off-by: Alexander Kojevnikov <alexander kojevnikov com>

 .../Banshee.Gui.Widgets/TrackInfoDisplay.cs        |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/Core/Banshee.ThickClient/Banshee.Gui.Widgets/TrackInfoDisplay.cs b/src/Core/Banshee.ThickClient/Banshee.Gui.Widgets/TrackInfoDisplay.cs
index b9d0a9a..27716fd 100644
--- a/src/Core/Banshee.ThickClient/Banshee.Gui.Widgets/TrackInfoDisplay.cs
+++ b/src/Core/Banshee.ThickClient/Banshee.Gui.Widgets/TrackInfoDisplay.cs
@@ -406,6 +406,9 @@ namespace Banshee.Gui.Widgets
             string artwork_id = track.ArtworkId;
             if (current_artwork_id != artwork_id || force) {
                 current_artwork_id = artwork_id;
+                if (incoming_image != null && current_image != incoming_image && !IsMissingImage (incoming_image)) {
+                    ((IDisposable)incoming_image).Dispose ();
+                }
                 incoming_image = artwork_manager.LookupScaleSurface (artwork_id, ArtworkSizeRequest);
             }
 
@@ -414,6 +417,9 @@ namespace Banshee.Gui.Widgets
             }
 
             if (track == current_track) {
+                if (current_image != null && current_image != incoming_image && !IsMissingImage (current_image)) {
+                    ((IDisposable)current_image).Dispose ();
+                }
                 current_image = incoming_image;
             }
         }