[gtk+] Slow down about dialog animation a bit

[Matthias Clasen <matthiasc src gnome org>]

commit 9def8c20b8e79ac7a71affea892ac85c63e8cf7d
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 9 13:43:54 2013 -0500

    Slow down about dialog animation a bit

 gtk/gtkaboutdialog.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkaboutdialog.ui b/gtk/gtkaboutdialog.ui
index c0af639..f26c6d9 100644
--- a/gtk/gtkaboutdialog.ui
+++ b/gtk/gtkaboutdialog.ui
@@ -123,6 +123,7 @@
                 <property name="can_focus">True</property>
                 <property name="homogeneous">True</property>
                 <property name="transition-type">over-up-down</property>
+                <property name="transition-duration">600</property>
                 <child>
                   <object class="GtkBox" id="page_vbox">
                     <property name="visible">True</property>