widget-factory: Add dummy listbox placeholder

It doesn't do anything and isn't visible anyway, but it tests that
adding and removing placeholders works

diff --git a/demos/widget-factory/widget-factory.ui b/demos/widget-factory/widget-factory.ui
index dad8e90775b7eba41c2700eb550bbb606d696dba..ec0a394db6cbc6c1b175ec5262536b7e7adb72d3 100644 (file)
--- a/demos/widget-factory/widget-factory.ui
+++ b/demos/widget-factory/widget-factory.ui
@@ -1813,6 +1813,11 @@ microphone-sensitivity-medium-symbolic</property>
                             <child>
                               <object class="GtkListBox" id="listbox">
                                 <property name="selection-mode">none</property>
+                                <child type="placeholder">
+                                  <object class="GtkLabel">
+                                    <property name="label">No rows found</property>
+                                  </object>
+                                </child>
                                 <child>
                                   <object class="GtkListBoxRow" id="listboxrow1">
                                     <property name="activatable">0</property>