[niepce] Set about dialog transient.

[Hubert Figuière <hub src gnome org>]

commit 45b169dfa217b8bee060b666be705747dfe96470
Author: Hubert Figuière <hub figuiere net>
Date:   Thu Jun 4 16:29:13 2015 -0400

    Set about dialog transient.

 src/niepce/ui/niepceapplication.cpp |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/niepce/ui/niepceapplication.cpp b/src/niepce/ui/niepceapplication.cpp
index 49d9f84..e5ca04e 100644
--- a/src/niepce/ui/niepceapplication.cpp
+++ b/src/niepce/ui/niepceapplication.cpp
@@ -1,7 +1,7 @@
 /*
  * niepce - ui/niepceapplication.cpp
  *
- * Copyright (C) 2007-2014 Hubert Figuiere
+ * Copyright (C) 2007-2015 Hubert Figuiere
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -65,7 +65,7 @@ AppFrame::Ptr NiepceApplication::makeMainFrame()
 
 void NiepceApplication::on_action_file_open()
 {
-    
+
 }
 
 void NiepceApplication::on_about()
@@ -79,6 +79,7 @@ void NiepceApplication::on_about()
     dlg.set_comments(Glib::ustring(_("A digital photo application.\n\n"
                                      "Build options: ")) +
                      NIEPCE_BUILD_CONFIG);
+    dlg.set_transient_for(m_main_frame.lock()->gtkWindow());
     dlg.run();
 }