Speed up playqueue searches.

BUG: 209

models/playqueueproxymodel.cpp

@@ -41,6 +41,11 @@ bool PlayQueueProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sou
         return true;
     }
 
+    // Why is this sometimes called with a parent row???
+    if (-1!=sourceParent.row()) {
+        return false;
+    }
+
     const QModelIndex index = sourceModel()->index(sourceRow, 0, sourceParent);
     return matchesFilter(*static_cast<Song *>(index.internalPointer()));
 }