diff -r cef43609a374 -r 0133e565e072 src/document.ui
--- a/src/document.ui	Sat Dec 14 23:00:01 2019 +0200
+++ b/src/document.ui	Wed Jan 01 17:45:56 2020 +0200
@@ -19,19 +19,19 @@
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
      </property>
-     <widget class="PartRenderer" name="viewport"/>
      <widget class="QListView" name="listView"/>
+     <widget class="QFrame" name="viewportFrame">
+      <property name="frameShape">
+       <enum>QFrame::StyledPanel</enum>
+      </property>
+      <property name="frameShadow">
+       <enum>QFrame::Raised</enum>
+      </property>
+     </widget>
     </widget>
    </item>
   </layout>
  </widget>
- <customwidgets>
-  <customwidget>
-   <class>PartRenderer</class>
-   <extends>QOpenGLWidget</extends>
-   <header>gl/partrenderer.h</header>
-  </customwidget>
- </customwidgets>
  <resources/>
  <connections/>
 </ui>