Merge "mediawiki.action.edit.preview: Replace only title in firstHeading"

diff --cc resources/src/mediawiki.action/mediawiki.action.edit.preview.js
index 1878c89,9e00181..4e85dea
--- 1/resources/src/mediawiki.action/mediawiki.action.edit.preview.js
--- 2/resources/src/mediawiki.action/mediawiki.action.edit.preview.js
+++ b/resources/src/mediawiki.action/mediawiki.action.edit.preview.js
@@@ -116,9 -104,12 +116,9 @@@
                                prop: 'text|displaytitle|modules|categorieshtml|templates|langlinks|limitreporthtml',
                                disableeditsection: true
                        } );
 -                      if ( section !== '' ) {
 -                              postData.sectionpreview = '';
 -                      }
                        request = api.post( postData );
                        request.done( function ( response ) {
-                               var li, newList, $content, $parent, $list;
+                               var li, newList, $displaytitle, $content, $parent, $list;
                                if ( response.parse.modules ) {
                                        mw.loader.load( response.parse.modules.concat(
                                                response.parse.modulescripts,