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<title>[41788] trunk: Customize: Fix confusion related to visibility of Themes panel with drafted/scheduled changesets.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/41788">41788</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/41788","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>westonruter</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-10-07 05:59:45 +0000 (Sat, 07 Oct 2017)</dd>
</dl>

<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Customize: Fix confusion related to visibility of Themes panel with drafted/scheduled changesets.

* Prevent autoloading an existing draft/future changeset when theme not active.
* Add missing notifications container to Themes panel.
* Remove deactivation of themes panel when selected status is not publish.
* Show notification in Themes panel when themes cannot be previewed and disable preview buttons.
* Reject installTheme call when theme preview not available.
* Return promise from installTheme and eliminate use of global events in favor of promises.

Props westonruter, melchoyce, zoonini.
See <a href="https://core.trac.wordpress.org/ticket/37661">#37661</a>, <a href="https://core.trac.wordpress.org/ticket/39896">#39896</a>.
Fixes <a href="https://core.trac.wordpress.org/ticket/42126">#42126</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminjscustomizecontrolsjs">trunk/src/wp-admin/js/customize-controls.js</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizemanagerphp">trunk/src/wp-includes/class-wp-customize-manager.php</a></li>
<li><a href="#trunksrcwpincludescustomizeclasswpcustomizethemespanelphp">trunk/src/wp-includes/customize/class-wp-customize-themes-panel.php</a></li>
<li><a href="#trunksrcwpincludesscriptloaderphp">trunk/src/wp-includes/script-loader.php</a></li>
<li><a href="#trunktestsphpunittestscustomizemanagerphp">trunk/tests/phpunit/tests/customize/manager.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminjscustomizecontrolsjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/js/customize-controls.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/js/customize-controls.js       2017-10-07 00:39:41 UTC (rev 41787)
+++ trunk/src/wp-admin/js/customize-controls.js 2017-10-07 05:59:45 UTC (rev 41788)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2801,11 +2801,24 @@
</span><span class="cx" style="display: block; padding: 0 10px">                 * @returns {void}
</span><span class="cx" style="display: block; padding: 0 10px">                 */
</span><span class="cx" style="display: block; padding: 0 10px">                attachEvents: function() {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        var panel = this;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 var panel = this, toggleDisabledNotification;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // Attach regular panel events.
</span><span class="cx" style="display: block; padding: 0 10px">                        api.Panel.prototype.attachEvents.apply( panel );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        toggleDisabledNotification = function() {
+                               if ( 'publish' === api.state( 'selectedChangesetStatus' ).get() ) {
+                                       panel.notifications.remove( 'theme_switch_unavailable' );
+                               } else {
+                                       panel.notifications.add( new api.Notification( 'theme_switch_unavailable', {
+                                               message: api.l10n.themePreviewUnavailable,
+                                               type: 'warning'
+                                       } ) );
+                               }
+                       };
+                       toggleDisabledNotification();
+                       api.state( 'selectedChangesetStatus' ).bind( toggleDisabledNotification );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                         // Collapse panel to customize the current theme.
</span><span class="cx" style="display: block; padding: 0 10px">                        panel.contentContainer.on( 'click', '.customize-theme', function() {
</span><span class="cx" style="display: block; padding: 0 10px">                                panel.collapse();
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2887,18 +2900,32 @@
</span><span class="cx" style="display: block; padding: 0 10px">                 *
</span><span class="cx" style="display: block; padding: 0 10px">                 * @since 4.9.0
</span><span class="cx" style="display: block; padding: 0 10px">                 *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                 * @returns {void}
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+          * @param {jQuery.Event} event - Event.
+                * @returns {jQuery.promise} Promise.
</ins><span class="cx" style="display: block; padding: 0 10px">                  */
</span><span class="cx" style="display: block; padding: 0 10px">                installTheme: function( event ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        var panel = this, preview = false, slug = $( event.target ).data( 'slug' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 var panel = this, preview, onInstallSuccess, slug = $( event.target ).data( 'slug' ), deferred = $.Deferred(), request;
+                       preview = $( event.target ).hasClass( 'preview' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        // Prevent loading a non-active theme preview when there is a drafted/scheduled changeset.
+                       if ( 'publish' !== api.state( 'selectedChangesetStatus' ).get() && slug !== api.settings.theme.stylesheet ) {
+                               deferred.reject({
+                                       errorCode: 'theme_switch_unavailable'
+                               });
+                               return deferred.promise();
+                       }
+
+                       // Theme is already being installed.
</ins><span class="cx" style="display: block; padding: 0 10px">                         if ( _.contains( panel.installingThemes, slug ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                return; // Theme is already being installed.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         deferred.reject({
+                                       errorCode: 'theme_already_installing'
+                               });
+                               return deferred.promise();
</ins><span class="cx" style="display: block; padding: 0 10px">                         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        wp.updates.maybeRequestFilesystemCredentials( event );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $( document ).one( 'wp-theme-install-success', function( event, response ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 onInstallSuccess = function( response ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 var theme = false, themeControl;
</span><span class="cx" style="display: block; padding: 0 10px">                                if ( preview ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                        api.notifications.remove( 'theme_installing' );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2915,6 +2942,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                        // Don't add the same theme more than once.
</span><span class="cx" style="display: block; padding: 0 10px">                                        if ( ! theme || api.control.has( 'installed_theme_' + theme.id ) ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                                deferred.resolve( response );
</ins><span class="cx" style="display: block; padding: 0 10px">                                                 return;
</span><span class="cx" style="display: block; padding: 0 10px">                                        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2939,23 +2967,29 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                                }
</span><span class="cx" style="display: block; padding: 0 10px">                                        });
</span><span class="cx" style="display: block; padding: 0 10px">                                }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        } );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         deferred.resolve( response );
+                       };
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        panel.installingThemes.push( $( event.target ).data( 'slug' ) ); // Note: we don't remove elements from installingThemes, since they shouldn't be installed again.
-                       wp.updates.installTheme( {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 panel.installingThemes.push( slug ); // Note: we don't remove elements from installingThemes, since they shouldn't be installed again.
+                       request = wp.updates.installTheme( {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 slug: slug
</span><span class="cx" style="display: block; padding: 0 10px">                        } );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // Also preview the theme as the event is triggered on Install & Preview.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( $( event.target ).hasClass( 'preview' ) ) {
-                               preview = true;
-
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( preview ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 api.notifications.add( new api.OverlayNotification( 'theme_installing', {
</span><span class="cx" style="display: block; padding: 0 10px">                                        message: api.l10n.themeDownloading,
</span><span class="cx" style="display: block; padding: 0 10px">                                        type: 'info',
</span><span class="cx" style="display: block; padding: 0 10px">                                        loading: true
</span><span class="cx" style="display: block; padding: 0 10px">                                } ) );
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+                       request.done( onInstallSuccess );
+                       request.fail( function() {
+                               api.notifications.remove( 'theme_installing' );
+                       } );
+
+                       return deferred.promise();
</ins><span class="cx" style="display: block; padding: 0 10px">                 },
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2969,6 +3003,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                loadThemePreview: function( themeId ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        var deferred = $.Deferred(), onceProcessingComplete, urlParser, queryParams;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        // Prevent loading a non-active theme preview when there is a drafted/scheduled changeset.
+                       if ( 'publish' !== api.state( 'selectedChangesetStatus' ).get() && themeId !== api.settings.theme.stylesheet ) {
+                               return deferred.reject().promise();
+                       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                         urlParser = document.createElement( 'a' );
</span><span class="cx" style="display: block; padding: 0 10px">                        urlParser.href = location.href;
</span><span class="cx" style="display: block; padding: 0 10px">                        queryParams = _.extend(
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4741,14 +4780,25 @@
</span><span class="cx" style="display: block; padding: 0 10px">                 * @since 4.2.0
</span><span class="cx" style="display: block; padding: 0 10px">                 */
</span><span class="cx" style="display: block; padding: 0 10px">                ready: function() {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        var control = this;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 var control = this, disableSwitchButtons, updateButtons;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        disableSwitchButtons = function() {
+                               return 'publish' !== api.state( 'selectedChangesetStatus' ).get() && control.params.theme.id !== api.settings.theme.stylesheet;
+                       };
+                       updateButtons = function() {
+                               control.container.find( 'button' ).toggleClass( 'disabled', disableSwitchButtons() );
+                       };
+
+                       api.state( 'selectedChangesetStatus' ).bind( updateButtons );
+                       updateButtons();
+
</ins><span class="cx" style="display: block; padding: 0 10px">                         control.container.on( 'touchmove', '.theme', function() {
</span><span class="cx" style="display: block; padding: 0 10px">                                control.touchDrag = true;
</span><span class="cx" style="display: block; padding: 0 10px">                        });
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // Bind details view trigger.
</span><span class="cx" style="display: block; padding: 0 10px">                        control.container.on( 'click keydown touchend', '.theme', function( event ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                var section;
</ins><span class="cx" style="display: block; padding: 0 10px">                                 if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                        return;
</span><span class="cx" style="display: block; padding: 0 10px">                                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4764,7 +4814,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                event.preventDefault(); // Keep this AFTER the key filter above
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                api.section( control.section() ).showDetails( control.params.theme );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         section = api.section( control.section() );
+                               section.showDetails( control.params.theme, function() {
+                                       section.overlay.find( '.theme-actions button' ).toggleClass( 'disabled', disableSwitchButtons() );
+                               } );
</ins><span class="cx" style="display: block; padding: 0 10px">                         });
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        control.container.on( 'render-screenshot', function() {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -7339,24 +7392,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                history.replaceState( {}, document.title, urlParser.href );
</span><span class="cx" style="display: block; padding: 0 10px">                        };
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        // Deactivate themes panel if changeset status is not auto-draft.
-                       api.panel( 'themes', function( themesPanel ) {
-                               var isPanelActive, updatePanelActive;
-
-                               isPanelActive = function() {
-                                       return 'publish' === selectedChangesetStatus.get() && ( ! changesetStatus() || 'auto-draft' === changesetStatus() );
-                               };
-                               themesPanel.active.validate = isPanelActive;
-
-                               updatePanelActive = function() {
-                                       themesPanel.active.set( isPanelActive() );
-                               };
-
-                               updatePanelActive();
-                               changesetStatus.bind( updatePanelActive );
-                               selectedChangesetStatus.bind( updatePanelActive );
-                       } );
-
</del><span class="cx" style="display: block; padding: 0 10px">                         // Show changeset UUID in URL when in branching mode and there is a saved changeset.
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( api.settings.changeset.branching ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                changesetStatus.bind( function( newStatus ) {
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizemanagerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-customize-manager.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-manager.php      2017-10-07 00:39:41 UTC (rev 41787)
+++ trunk/src/wp-includes/class-wp-customize-manager.php        2017-10-07 05:59:45 UTC (rev 41788)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -607,7 +607,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                if ( empty( $this->_changeset_uuid ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $changeset_uuid = null;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( ! $this->branching() ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( ! $this->branching() && $this->is_theme_active() ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 $unpublished_changeset_posts = $this->get_changeset_posts( array(
</span><span class="cx" style="display: block; padding: 0 10px">                                        'post_status' => array_diff( get_post_stati(), array( 'auto-draft', 'publish', 'trash', 'inherit', 'private' ) ),
</span><span class="cx" style="display: block; padding: 0 10px">                                        'exclude_restore_dismissed' => false,
</span></span></pre></div>
<a id="trunksrcwpincludescustomizeclasswpcustomizethemespanelphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/customize/class-wp-customize-themes-panel.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/customize/class-wp-customize-themes-panel.php       2017-10-07 00:39:41 UTC (rev 41787)
+++ trunk/src/wp-includes/customize/class-wp-customize-themes-panel.php 2017-10-07 05:59:45 UTC (rev 41788)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -88,6 +88,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        </div>
</span><span class="cx" style="display: block; padding: 0 10px">                                <# } #>
</span><span class="cx" style="display: block; padding: 0 10px">                        <?php endif; ?>
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+                       <div class="customize-control-notifications-container"></div>
</ins><span class="cx" style="display: block; padding: 0 10px">                 </li>
</span><span class="cx" style="display: block; padding: 0 10px">                <li class="customize-themes-full-container-container">
</span><span class="cx" style="display: block; padding: 0 10px">                        <div class="customize-themes-full-container">
</span></span></pre></div>
<a id="trunksrcwpincludesscriptloaderphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/script-loader.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/script-loader.php   2017-10-07 00:39:41 UTC (rev 41787)
+++ trunk/src/wp-includes/script-loader.php     2017-10-07 05:59:45 UTC (rev 41788)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -580,7 +580,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                'trashConfirm'       => __( 'Are you sure you&#8217;d like to discard your unpublished changes?' ),
</span><span class="cx" style="display: block; padding: 0 10px">                /* translators: %s: URL to the Customizer to load the autosaved version */
</span><span class="cx" style="display: block; padding: 0 10px">                'autosaveNotice'     => __( 'There is a more recent autosave of your changes than the one you are previewing. <a href="%s">Restore the autosave</a>' ),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                'videoHeaderNotice'  => __( 'This theme doesn\'t support video headers on this page. Navigate to the front page or another page that supports video headers.' ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         'videoHeaderNotice'  => __( 'This theme doesn&#8217;t support video headers on this page. Navigate to the front page or another page that supports video headers.' ),
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Used for overriding the file types allowed in plupload.
</span><span class="cx" style="display: block; padding: 0 10px">                'allowedFiles'       => __( 'Allowed Files' ),
</span><span class="cx" style="display: block; padding: 0 10px">                'customCssError'     => wp_array_slice_assoc(
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -595,6 +595,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        array( 'singular', 'plural' )
</span><span class="cx" style="display: block; padding: 0 10px">                ),
</span><span class="cx" style="display: block; padding: 0 10px">                'scheduleDescription' => __( 'Schedule your customization changes to publish ("go live") at a future date.' ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                'themePreviewUnavailable' => __( 'Sorry, you can&#8217;t preview new themes when you have changes scheduled or saved as a draft. Please publish your changes, or wait until they publish to preview new themes.' ),
</ins><span class="cx" style="display: block; padding: 0 10px">         ) );
</span><span class="cx" style="display: block; padding: 0 10px">        $scripts->add( 'customize-selective-refresh', "/wp-includes/js/customize-selective-refresh$suffix.js", array( 'jquery', 'wp-util', 'customize-preview' ), false, 1 );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunktestsphpunittestscustomizemanagerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/customize/manager.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/customize/manager.php   2017-10-07 00:39:41 UTC (rev 41787)
+++ trunk/tests/phpunit/tests/customize/manager.php     2017-10-07 05:59:45 UTC (rev 41788)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -197,6 +197,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">                ) );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertNotContains( $wp_customize->changeset_uuid(), array( $uuid1, $uuid2 ) );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEmpty( $wp_customize->changeset_post_id() );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+               // Make sure existing changeset is not autoloaded in the case of previewing a theme switch.
+               switch_theme( 'twentyseventeen' );
+               $wp_customize = new WP_Customize_Manager( array(
+                       'changeset_uuid' => false, // Cause UUID to be deferred.
+                       'branching' => false,
+                       'theme' => 'twentyfifteen',
+               ) );
+               $this->assertEmpty( $wp_customize->changeset_post_id() );
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span></span></pre>
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