gtk3-demo: Drop .sidebar class

This makes no visual difference at all, and the .sidebar class
is causing some complications with the current CSS node transition.

diff --git a/demos/gtk-demo/main.ui b/demos/gtk-demo/main.ui
index 7037f2ffac1063ea4e08d0c3eb2cce46d5a50767..793bbde2646d7f30038deac31ea4ee7baa87fdd0 100644 (file)
--- a/demos/gtk-demo/main.ui
+++ b/demos/gtk-demo/main.ui
@@ -72,9 +72,6 @@
                 <property name="can_focus">1</property>
                 <property name="hscrollbar_policy">never</property>
                 <property name="min_content_width">150</property>
-                <style>
-                  <class name="sidebar"/>
-                </style>
                 <child>
                   <object class="GtkTreeView" id="treeview">
                     <property name="visible">1</property>