[gnome-tetravex] Computing is not magic.

[Arnaud B. <arnaudb src gnome org>]

commit 075e9c99a23a29a9c9d9a94bb9a5dfc40e3db0aa
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Sep 19 18:11:31 2019 +0200

    Computing is not magic.
    
    See also: 94bf641d.
    Fixes #5, for real.

 src/gnome-tetravex.vala | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/gnome-tetravex.vala b/src/gnome-tetravex.vala
index 8b241f7..a425a78 100644
--- a/src/gnome-tetravex.vala
+++ b/src/gnome-tetravex.vala
@@ -360,13 +360,16 @@ private class Tetravex : Gtk.Application
             window.destroy ();
         else if (score_dialog_action == ResponseType.OK)
             new_game ();
-        else
+        else if (score_dialog_action != ResponseType.REJECT)
             new_game_solve_stack.set_visible_child_name ("new-game");
     }
 
     private bool scores_dialog_visible = false; // security for #5
     private int show_scores (HistoryEntry? selected_entry = null, bool show_quit = false)
     {
+        if (scores_dialog_visible)
+            return ResponseType.REJECT;
+
         scores_dialog_visible = true;
         ScoreDialog dialog = new ScoreDialog (history, selected_entry, show_quit);
         dialog.modal = true;