[gnome-chess] Promotion type selector dialog should fit mobile screens

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 25cba4973af88c87d448785088068a505cf81aba
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Fri Dec 4 16:51:34 2020 -0600

    Promotion type selector dialog should fit mobile screens

 src/gnome-chess.vala | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index aa661f6..dcf62c3 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -355,6 +355,10 @@ Copyright © 2015–2016 Sahil Sareen""";
         promotion_type_selector_dialog = (Dialog) promotion_type_selector_builder.get_object 
("dialog_promotion_type_selector");
         promotion_type_selector_dialog.transient_for = window;
 
+        var button_box = (ButtonBox) promotion_type_selector_builder.get_object ("button_box");
+        if (layout_mode == LayoutMode.NARROW)
+            button_box.orientation = Orientation.VERTICAL;
+
         string color;
         if (game.current_player.color == Color.WHITE)
             color = "white";