[gnome-chess/gnome-3-10] Do not enable pause action when browsing history

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9221f29c8e687a35b24ab71e605a9149be556372
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Jun 25 14:18:43 2014 -0500

    Do not enable pause action when browsing history
    
    If a game is already completed, moving around in history could cause the
    pause button to become sensitive.

 src/gnome-chess.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 34571d8..f0717ce 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -741,10 +741,13 @@ public class Application : Gtk.Application
 
     private void game_turn_cb (ChessGame game, ChessPlayer player)
     {
+        if (!game.is_started)
+            return;
+
         if (game.clock != null)
             pause_button.sensitive = true;
         
-        if (game.is_started && opponent_engine != null && player == opponent)
+        if (opponent_engine != null && player == opponent)
             opponent_engine.request_move ();
     }