Partition: add method DatabaseModified()

src/Instance.cxx

@@ -31,7 +31,7 @@ Instance::DeleteSong(const Song &song)
 void
 Instance::DatabaseModified()
 {
-	partition->playlist.FullIncrementVersions();
+	partition->DatabaseModified();
 	idle_add(IDLE_DATABASE);
 }
 

src/Partition.cxx

@@ -21,6 +21,12 @@
 #include "Partition.hxx"
 #include "Song.hxx"
 
+void
+Partition::DatabaseModified()
+{
+	playlist.FullIncrementVersions();
+}
+
 void
 Partition::TagModified()
 {

src/Partition.hxx

@@ -166,6 +166,12 @@ struct Partition {
 		playlist.SetConsume(new_value);
 	}
 
+	/**
+	 * The database has been modified.  Propagate the change to
+	 * all subsystems.
+	 */
+	void DatabaseModified();
+
 	/**
 	 * A tag in the play queue has been modified by the player
 	 * thread.  Propagate the change to all subsystems.