[gnome-sudoku] Disallow printing actions when the "print current" dialog is shown.

[Parin Porecha <parinporecha src gnome org>]

commit e7faa83273bfaf0ac6a0467d4538713d74cf7344
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Aug 23 19:36:12 2014 +0200

    Disallow printing actions when the "print current" dialog is shown.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=735260

 src/gnome-sudoku.vala |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-sudoku.vala b/src/gnome-sudoku.vala
index b0354e9..c24d532 100644
--- a/src/gnome-sudoku.vala
+++ b/src/gnome-sudoku.vala
@@ -32,6 +32,7 @@ public class Sudoku : Gtk.Application
     private SimpleAction redo_action;
     private SimpleAction clear_action;
     private SimpleAction print_action;
+    private SimpleAction print_multiple_action;
 
     private string header_bar_subtitle;
 
@@ -159,6 +160,7 @@ public class Sudoku : Gtk.Application
         redo_action = (SimpleAction) lookup_action ("redo");
         clear_action = (SimpleAction) lookup_action ("reset");
         print_action = (SimpleAction) lookup_action ("print");
+        print_multiple_action = (SimpleAction) lookup_action ("print-multiple");
 
         saver = new SudokuSaver ();
         var savegame = saver.get_savedgame ();
@@ -359,8 +361,12 @@ public class Sudoku : Gtk.Application
     {
         if (main_stack.get_visible_child_name () != "frame")
             return;
+        print_action.set_enabled (false);
+        print_multiple_action.set_enabled (false);
         var printer = new SudokuPrinter ({game.board.clone ()}, ref window);
         printer.print_sudoku ();
+        print_action.set_enabled (true);
+        print_multiple_action.set_enabled (true);
     }
 
     private void print_multiple_cb ()