[five-or-more/arnaudb/wip/gtk4: 14/28] Adapt to Box API.

[Arnaud B. <arnaudb src gnome org>]

commit eec2e64ca670d49bd8c83c2d279c3e707856722f
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Mar 12 23:35:03 2020 +0100

    Adapt to Box API.

 src/window.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/window.vala b/src/window.vala
index 778f438..5b49f01 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -73,7 +73,7 @@ private class GameWindow : ApplicationWindow
             maximize ();
 
         NextPiecesWidget next_pieces_widget = new NextPiecesWidget (settings, game, theme);
-        preview_hbox.pack_start (next_pieces_widget);
+        preview_hbox.add (next_pieces_widget);
         next_pieces_widget.realize ();
         next_pieces_widget.show ();