Ticket #31687: 31687.2.diff

wp-admin/js/customize-controls.js

@@ -2118 +2118 @@
                 tmpl = api.settings.documentTitleTmpl;
                 title = tmpl.replace( '%s', documentTitle );
                 document.title = title;
-                if ( window !== window.parent ) {
-                        window.parent.document.title = document.title;
-                }
+                api.trigger( 'title', title );
         };
 
         /**
@@ -2799 +2797 @@
                                 window.location = api.settings.url.activated;
                 });
 
+                // Pass titles to the parent
+                api.bind( 'title', function( newTitle ) {
+                        parent.send( 'title', newTitle );
+                });
+
                 // Initialize the connection with the parent frame.
                 parent.send( 'ready' );
 

wp-includes/js/customize-loader.js

@@ -155 +155 @@
                                 Loader.saved( false );
                         } );
 
+                        this.messenger.bind( 'title', function( newTitle ){
+                                window.document.title = newTitle;
+                        });
+
                         this.pushState( src );
 
                         this.trigger( 'open' );