[iagno] Move undo from the app menu to the window

[Michael Catanzaro <mcatanzaro src gnome org>]

commit bac6c98c0b26463b4ae4d67f026103eca6459a64
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Feb 8 18:13:19 2014 -0600

    Move undo from the app menu to the window

 data/iagno.ui  |    4 ----
 src/iagno.vala |   14 ++++++++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/data/iagno.ui b/data/iagno.ui
index d86ea28..a76abaa 100644
--- a/data/iagno.ui
+++ b/data/iagno.ui
@@ -9,10 +9,6 @@
         <attribute name="accel">&lt;Primary&gt;n</attribute>
       </item>
       <item>
-        <attribute name="label" translatable="yes">_Undo</attribute>
-        <attribute name="action">app.undo-move</attribute>
-      </item>
-      <item>
         <attribute name="label" translatable="yes">_Preferences</attribute>
         <attribute name="action">app.preferences</attribute>
       </item>
diff --git a/src/iagno.vala b/src/iagno.vala
index 74eb16a..71e1deb 100644
--- a/src/iagno.vala
+++ b/src/iagno.vala
@@ -96,9 +96,23 @@ public class Iagno : Gtk.Application
         else if (settings.get_boolean ("window-is-maximized"))
             window.maximize ();
 
+        var image = new Gtk.Image ();
+        image.icon_size = Gtk.IconSize.BUTTON;
+        if (Gtk.Widget.get_default_direction () == Gtk.TextDirection.RTL)
+            image.icon_name = "edit-undo-rtl-symbolic";
+        else
+            image.icon_name = "edit-undo-symbolic";
+
+        var undo_button = new Gtk.Button ();
+        undo_button.image = image;
+        undo_button.valign = Gtk.Align.CENTER;
+        undo_button.action_name = "app.undo-move";
+        undo_button.show ();
+
         headerbar = new Gtk.HeaderBar ();
         headerbar.show_close_button = true;
         headerbar.set_title (_("Iagno"));
+        headerbar.pack_start (undo_button);
         headerbar.show ();
         window.set_titlebar (headerbar);