[banshee] AudiobookLibrarySource: Accept tracks dragged from playlists

[Bertrand Lorentz <blorentz src gnome org>]

commit 48320e1df0f06f1f6dc85a301a15b739723368a8
Author: Bertrand Lorentz <bertrand lorentz gmail com>
Date:   Wed Dec 21 19:19:46 2011 +0100

    AudiobookLibrarySource: Accept tracks dragged from playlists
    
    Override AcceptsInputFromSource so that you can drag tracks
    from playlists and smart playlists into the Audiobook
    source. Fixes bgo#608389.

 .../Banshee.Audiobook/AudiobookLibrarySource.cs    |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/Extensions/Banshee.Audiobook/Banshee.Audiobook/AudiobookLibrarySource.cs b/src/Extensions/Banshee.Audiobook/Banshee.Audiobook/AudiobookLibrarySource.cs
index 0d06777..5fa73b0 100644
--- a/src/Extensions/Banshee.Audiobook/Banshee.Audiobook/AudiobookLibrarySource.cs
+++ b/src/Extensions/Banshee.Audiobook/Banshee.Audiobook/AudiobookLibrarySource.cs
@@ -338,6 +338,12 @@ namespace Banshee.Audiobook
             yield return books_model;
         }
 
+        public override bool AcceptsInputFromSource (Source source)
+        {
+            return CanAddTracks && source != this && source.Parent != this
+                && (source.Parent is PrimarySource || source is PrimarySource);
+        }
+
         #region IBasicPlaybackController implementation
 
         public bool First ()