[pitivi] undo: Enable undo/redo in devel

[Alexandru Băluț <alexbalut src gnome org>]

commit c17fd0f095dc1e8d8b8ff6e6934a26e8d4dc502a
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Wed Jan 6 23:55:29 2016 +0100

    undo: Enable undo/redo in devel
    
    Required to be able to test the fixes which seem to be many.
    
    Differential Revision: https://phabricator.freedesktop.org/D631

 pitivi/application.py |    4 ++--
 pitivi/mainwindow.py  |    7 ++++---
 2 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/pitivi/application.py b/pitivi/application.py
index 59a1786..458a0ea 100644
--- a/pitivi/application.py
+++ b/pitivi/application.py
@@ -29,7 +29,7 @@ from gi.repository import Gio
 from gi.repository import Gtk
 from gi.repository import Gst
 
-from pitivi.configure import VERSION, RELEASES_URL
+from pitivi.configure import VERSION, RELEASES_URL, in_devel
 from pitivi.dialogs.startupwizard import StartUpWizard
 from pitivi.effects import EffectsManager
 from pitivi.mainwindow import PitiviMainWindow
@@ -358,7 +358,7 @@ class Pitivi(Gtk.Application, Loggable):
     def _syncDoUndo(self, action_log):
         can_undo = bool(action_log.undo_stacks)
         # TODO: Remove this once we revisit undo/redo T3360
-        can_undo = False
+        can_undo = in_devel()
         self.undo_action.set_enabled(can_undo)
 
         can_redo = bool(action_log.redo_stacks)
diff --git a/pitivi/mainwindow.py b/pitivi/mainwindow.py
index 5db1837..e26a8b3 100644
--- a/pitivi/mainwindow.py
+++ b/pitivi/mainwindow.py
@@ -447,9 +447,10 @@ class PitiviMainWindow(Gtk.ApplicationWindow, Loggable):
         self.render_button.connect("clicked", self._renderCb)
 
         # TODO: Add these back once we revisit undo/redo T3360
-        # self._headerbar.pack_start(undo_button)
-        # self._headerbar.pack_start(redo_button)
-        # self._headerbar.pack_start(separator)
+        if in_devel():
+            self._headerbar.pack_start(undo_button)
+            self._headerbar.pack_start(redo_button)
+            self._headerbar.pack_start(separator)
         self._headerbar.pack_start(self.save_button)
         self._headerbar.pack_start(self.render_button)