[gitg/vala] Show about dialog on window

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 21cfbc11fb6f7f819f51656cd80b6207089a3c39
Author: Jesse van den Kieboom <jesse vandenkieboom epfl ch>
Date:   Wed Jul 18 16:42:06 2012 +0200

    Show about dialog on window

 gitg/gitg-application.vala |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gitg/gitg-application.vala b/gitg/gitg-application.vala
index 5ed5585..af998aa 100644
--- a/gitg/gitg-application.vala
+++ b/gitg/gitg-application.vala
@@ -199,7 +199,9 @@ public class Application : Gtk.Application
 			catch {}
 		}
 
-		Gtk.show_about_dialog(null,
+		unowned List<Gtk.Window> wnds = get_windows();
+
+		Gtk.show_about_dialog(wnds != null ? wnds.data : null,
 		                      "authors", authors,
 		                      "copyright", copyright,
 		                      "comments", comments,