rind: Check playlist children when determining visibility

Otherwise nested playlists might not show up, even if we search for them

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

rind/node.py

@@ -100,7 +100,10 @@ class NodeTreeModel(GObject.GObject, Gtk.TreeModel):
     def is_visible(self, model, iter, data):
         plist = self.iter_playlist(iter)
         if isinstance(plist, curds.Playlist):
-            return self.filter_re.search(plist.name) != None
+            for n in plist.walk(root=True):
+                if self.filter_re.search(n.name) != None:
+                    return True
+            return False
         return True
 
     def iter_playlist(self, iter):