Switch to side-by-side view

--- a/src/qtgui/preview_w.cpp
+++ b/src/qtgui/preview_w.cpp
@@ -750,7 +750,7 @@
             }
         }
     } else {
-        LOGDEB("Preview: no hilighting, loading " << lthr.fdoc.text.size() <<
+        LOGDEB("Preview: no highlighting, loading " << lthr.fdoc.text.size() <<
                " bytes\n");
         // No plaintorich() call.  In this case, either the text is
         // html and the html quoting is hopefully correct, or it's