[rygel] core: Fix XBox music browsing

[Jens Georg <jensgeorg src gnome org>]

commit b00e4df31801671ca920723d1c6e14a0e02fd8ed
Author: Jens Georg <mail jensge org>
Date:   Mon Mar 5 13:07:54 2012 +0200

    core: Fix XBox music browsing
    
    9aff5d6 was filtering out everything on Album/Artist view on Tracker plugin.

 src/rygel/rygel-xbox-hacks.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/rygel/rygel-xbox-hacks.vala b/src/rygel/rygel-xbox-hacks.vala
index 5622e53..b2f046c 100644
--- a/src/rygel/rygel-xbox-hacks.vala
+++ b/src/rygel/rygel-xbox-hacks.vala
@@ -147,7 +147,8 @@ internal class Rygel.XBoxHacks : ClientHacks {
 
                 if (rel_expression.op == SearchCriteriaOp.DERIVED_FROM &&
                     rel_expression.operand2 != null &&
-                    rel_expression.operand2 == AudioItem.UPNP_CLASS) {
+                    rel_expression.operand2 == AudioItem.UPNP_CLASS &&
+                    container.id == "0") {
                     modified_expression = this.rewrite_search_expression
                                         (expression);
                 }