message: Remove placeholder items.
diff: <property name="sortingEnabled">
  <bool>true</bool>
  </property>
  - <item>
  - <property name="text">
  - <string>Counter 1</string>
  - </property>
  - </item>
  - <item>
  - <property name="text">
  - <string>Cache miss</string>
  - </property>
  - </item>
  - <item>
  - <property name="text">
  - <string>Counter 2</string>
  - </property>
  - </item>
  </widget>
  </item>
  <item>
  