Fix changing playlist (Track is responsible for signal emission)

libs/ardour/ardour/disk_io.h

@@ -110,8 +110,6 @@ class LIBARDOUR_API DiskIOProcessor : public Processor
 	virtual void playlist_modified () {}
 	virtual int use_playlist (DataType, boost::shared_ptr<Playlist>);
 
-	PBD::Signal1<void,DataType>   PlaylistChanged;
-
 	virtual void adjust_buffering() = 0;
 
   protected:

libs/ardour/disk_io.cc

@@ -362,9 +362,6 @@ DiskIOProcessor::use_playlist (DataType dt, boost::shared_ptr<Playlist> playlist
 
 	DEBUG_TRACE (DEBUG::DiskIO, string_compose ("%1 now using playlist %1 (%2)\n", name(), playlist->name(), playlist->id()));
 
-	PlaylistChanged (dt); /* EMIT SIGNAL */
-	_session.set_dirty ();
-
 	return 0;
 }
 

libs/ardour/track.cc

@@ -827,6 +827,9 @@ Track::use_playlist (DataType dt, boost::shared_ptr<Playlist> p)
 		_playlists[dt] = p;
 	}
 
+	_session.set_dirty ();
+	PlaylistChanged (); /* EMIT SIGNAL */
+
 	return ret;
 }