[tali] Disallow creation of multiple windows

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 4900022d4ccb1a8cf84a784ebc8b9c73d6b2aa00
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Sep 25 17:34:54 2014 -0500

    Disallow creation of multiple windows

 src/gyahtzee.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/src/gyahtzee.c b/src/gyahtzee.c
index 65f45f9..45e03f8 100644
--- a/src/gyahtzee.c
+++ b/src/gyahtzee.c
@@ -843,10 +843,15 @@ GyahtzeeCreateMainWindow (GApplication *app, gpointer user_data)
 
   gtk_widget_show (hbox);
   gtk_widget_show (vbox);
+}
 
-  gtk_widget_show (window);
-
-  GyahtzeeNewGame ();
+static void
+GyahtzeeActivateGame (GApplication *app, gpointer user_data)
+{
+  if (!gtk_widget_is_visible (window)) {
+    gtk_widget_show (window);
+    GyahtzeeNewGame ();
+  }
 }
 
 int
@@ -865,7 +870,8 @@ main (int argc, char *argv[])
   textdomain (GETTEXT_PACKAGE);
 
   application = gtk_application_new ("org.gnome.tali", 0);
-  g_signal_connect (application, "activate", G_CALLBACK (GyahtzeeCreateMainWindow), NULL);
+  g_signal_connect (application, "startup", G_CALLBACK (GyahtzeeCreateMainWindow), NULL);
+  g_signal_connect (application, "activate", G_CALLBACK (GyahtzeeActivateGame), NULL);
 
   games_scores_startup ();