[gnome-music/wip/mschraal/player-shuffle-return-order] corealbum: Use Gtk.Ordering for sorter

[Marinus Schraal <mschraal src gnome org>]

commit 110dab14c186c7c1b5d7a5aa7cd4877b77af0692
Author: Marinus Schraal <mschraal gnome org>
Date:   Tue Apr 5 10:52:16 2022 +0200

    corealbum: Use Gtk.Ordering for sorter

 gnomemusic/corealbum.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/gnomemusic/corealbum.py b/gnomemusic/corealbum.py
index 27008184e..af3a1198c 100644
--- a/gnomemusic/corealbum.py
+++ b/gnomemusic/corealbum.py
@@ -80,7 +80,13 @@ class CoreAlbum(GObject.GObject):
         disc_model_sort = Gtk.SortListModel.new(disc_model)
 
         def _disc_order_sort(disc_a, disc_b, data=None):
-            return disc_a.props.disc_nr - disc_b.props.disc_nr
+            order = disc_a.props.disc_nr - disc_b.props.disc_nr
+            if order < 0:
+                return Gtk.Ordering.SMALLER
+            elif order > 0:
+                return Gtk.Ordering.LARGER
+            else:
+                return Gtk.Ordering.EQUAL
 
         disc_sorter = Gtk.CustomSorter()
         disc_sorter.set_sort_func(_disc_order_sort)