Switch to side-by-side view

--- a/src/qtgui/uiprefs.ui
+++ b/src/qtgui/uiprefs.ui
@@ -127,6 +127,19 @@
              <property name="text">
               <string>Prefer Html to plain text for preview.</string>
              </property>
+             <property name="checked">
+              <bool>false</bool>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QCheckBox" name="previewActiveLinksCB">
+             <property name="text">
+              <string>Activate links in preview.</string>
+             </property>
+               <property name="toolTip">
+                <string>Make links inside the preview window clickable, and start an external browser when they are clicked.</string>
+               </property>
              <property name="checked">
               <bool>false</bool>
              </property>