[gnome-2048/arnaudb/wip/gtk4: 54/57] Clean old game.

[Arnaud B. <arnaudb src gnome org>]

commit b3e3892731b1040c28b6d23e7b76287611381590
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Jul 20 18:01:05 2020 +0200

    Clean old game.

 src/game-window.vala | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/src/game-window.vala b/src/game-window.vala
index a530ab8..c7d4503 100644
--- a/src/game-window.vala
+++ b/src/game-window.vala
@@ -29,6 +29,7 @@ private class GameWindow : ApplicationWindow
     [GtkChild] private GameHeaderBar    _header_bar;
     [GtkChild] private AspectFrame      _frame;
                private Game             _game;
+               private bool             _game_init_done = false;
 
     [GtkChild] private Button           _unfullscreen_button;
     [GtkChild] private Label            _gameover_label;
@@ -50,6 +51,7 @@ private class GameWindow : ApplicationWindow
         _install_ui_action_entries ();
 
         _init_game ();
+        _game_init_done = true;
 
         _init_window ();
         _create_scores_dialog ();   // the library forbids to delay the dialog creation
@@ -94,6 +96,12 @@ private class GameWindow : ApplicationWindow
             GLib.Settings.sync ();
         }
 
+        if (_game_init_done)
+        {
+            ((!) _game).unparent ();
+            ((!) _game).destroy ();
+        }
+
         _game = new Game (ref _settings);
         _game.notify ["score"].connect (_header_bar.set_score);
         _game.finished.connect ((show_scores) => {