[gtk+] Work around a GtkBuilder deficiency

[Matthias Clasen <matthiasc src gnome org>]

commit 768a437c02a3db6a89c35d994056e03455b34b90
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 8 20:14:44 2014 -0400

    Work around a GtkBuilder deficiency
    
    It turns out that an <object> with just a <signal> in it does
    not work right in GtkBuilder. Work around by adding a property.

 modules/inspector/classes-list.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/modules/inspector/classes-list.ui b/modules/inspector/classes-list.ui
index b7198a3..e26700f 100644
--- a/modules/inspector/classes-list.ui
+++ b/modules/inspector/classes-list.ui
@@ -45,6 +45,7 @@
                 <property name="title" translatable="yes">Name</property>
                 <child>
                   <object class="GtkCellRendererToggle">
+                    <property name="activatable">True</property>
                     <signal name="toggled" handler="enabled_toggled"/>
                   </object>
                   <attributes>