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<title>[41205] trunk: Customize: Introduce `settings_previewed` arg and getter on `WP_Customize_Manager` which controls whether `WP_Customize_Setting::preview()` should be called on settings.</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/41205">41205</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/41205","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>2017-08-02 05:34:32 +0000 (Wed, 02 Aug 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: Introduce `settings_previewed` arg and getter on `WP_Customize_Manager` which controls whether `WP_Customize_Setting::preview()` should be called on settings.

The `settings_previewed` property eliminates the need for the Customizer components from having to look at global `doing_ajax` state. This is in particular needed when saving settings, as some settings will short-circuit the update operation if they detect no changes are introduced. This is also needed for low-level integrations with the Customizer, such as in REST API endpoints under development.

Props stubgo, westonruter, utkarshpatel for testing.
See <a href="https://core.trac.wordpress.org/ticket/38900">#38900</a>.
Fixes <a href="https://core.trac.wordpress.org/ticket/39221">#39221</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpcustomizemanagerphp">trunk/src/wp-includes/class-wp-customize-manager.php</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizenavmenusphp">trunk/src/wp-includes/class-wp-customize-nav-menus.php</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizewidgetsphp">trunk/src/wp-includes/class-wp-customize-widgets.php</a></li>
<li><a href="#trunksrcwpincludesthemephp">trunk/src/wp-includes/theme.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="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      2017-08-02 05:10:05 UTC (rev 41204)
+++ trunk/src/wp-includes/class-wp-customize-manager.php        2017-08-02 05:34:32 UTC (rev 41205)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -174,6 +174,14 @@
</span><span class="cx" style="display: block; padding: 0 10px">        protected $messenger_channel;
</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">+         * Whether settings should be previewed.
+        *
+        * @since 4.9.0
+        * @var bool
+        */
+       protected $settings_previewed;
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Unsanitized values for Customize Settings parsed from $_POST['customized'].
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @var array
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -213,15 +221,16 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @param array $args {
</span><span class="cx" style="display: block; padding: 0 10px">         *     Args.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         *     @type string $changeset_uuid    Changeset UUID, the post_name for the customize_changeset post containing the customized state. Defaults to new UUID.
-        *     @type string $theme             Theme to be previewed (for theme switch). Defaults to customize_theme or theme query params.
-        *     @type string $messenger_channel Messenger channel. Defaults to customize_messenger_channel query param.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  *     @type string $changeset_uuid     Changeset UUID, the post_name for the customize_changeset post containing the customized state. Defaults to new UUID.
+        *     @type string $theme              Theme to be previewed (for theme switch). Defaults to customize_theme or theme query params.
+        *     @type string $messenger_channel  Messenger channel. Defaults to customize_messenger_channel query param.
+        *     @type bool   $settings_previewed If settings should be previewed. Defaults to true.
</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">        public function __construct( $args = array() ) {
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $args = array_merge(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        array_fill_keys( array( 'changeset_uuid', 'theme', 'messenger_channel' ), null ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 array_fill_keys( array( 'changeset_uuid', 'theme', 'messenger_channel', 'settings_previewed' ), null ),
</ins><span class="cx" style="display: block; padding: 0 10px">                         $args
</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">@@ -242,9 +251,14 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $args['messenger_channel'] = sanitize_key( wp_unslash( $_REQUEST['customize_messenger_channel'] ) );
</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">+                if ( ! isset( $args['settings_previewed'] ) ) {
+                       $args['settings_previewed'] = true;
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->original_stylesheet = get_stylesheet();
</span><span class="cx" style="display: block; padding: 0 10px">                $this->theme = wp_get_theme( $args['theme'] );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->messenger_channel = $args['messenger_channel'];
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $this->settings_previewed = ! empty( $args['settings_previewed'] );
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->_changeset_uuid = $args['changeset_uuid'];
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                require_once( ABSPATH . WPINC . '/class-wp-customize-setting.php' );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -622,6 +636,18 @@
</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><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Gets whether settings are or will be previewed.
+        *
+        * @since 4.9.0
+        * @see WP_Customize_Setting::preview()
+        *
+        * @return bool
+        */
+       public function settings_previewed() {
+               return $this->settings_previewed;
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Get the changeset UUID.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 4.7.0
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -728,15 +754,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                 */
</span><span class="cx" style="display: block; padding: 0 10px">                do_action( 'customize_register', $this );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                /*
-                * Note that settings must be previewed here even outside the customizer preview
-                * and also in the customizer pane itself. This is to enable loading an existing
-                * changeset into the customizer. Previewing the settings only has to be prevented
-                * in the case of a customize_save action because then update_option()
-                * may short-circuit because it will detect that there are no changes to
-                * make.
-                */
-               if ( ! $this->doing_ajax( 'customize_save' ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( $this->settings_previewed() ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         foreach ( $this->settings as $setting ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $setting->preview();
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizenavmenusphp"></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-nav-menus.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-nav-menus.php    2017-08-02 05:10:05 UTC (rev 41204)
+++ trunk/src/wp-includes/class-wp-customize-nav-menus.php      2017-08-02 05:34:32 UTC (rev 41205)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -526,13 +526,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                $nav_menus_setting_ids[] = $setting_id;
</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">-                $this->manager->add_dynamic_settings( $nav_menus_setting_ids );
-               if ( ! $this->manager->doing_ajax( 'customize_save' ) ) {
-                       foreach ( $nav_menus_setting_ids as $setting_id ) {
-                               $setting = $this->manager->get_setting( $setting_id );
-                               if ( $setting ) {
-                                       $setting->preview();
-                               }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $settings = $this->manager->add_dynamic_settings( $nav_menus_setting_ids );
+               if ( $this->manager->settings_previewed() ) {
+                       foreach ( $settings as $setting ) {
+                               $setting->preview();
</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></div>
<a id="trunksrcwpincludesclasswpcustomizewidgetsphp"></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-widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-widgets.php      2017-08-02 05:10:05 UTC (rev 41204)
+++ trunk/src/wp-includes/class-wp-customize-widgets.php        2017-08-02 05:34:32 UTC (rev 41205)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -211,12 +211,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $settings = $this->manager->add_dynamic_settings( array_unique( $widget_setting_ids ) );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                /*
-                * Preview settings right away so that widgets and sidebars will get registered properly.
-                * But don't do this if a customize_save because this will cause WP to think there is nothing
-                * changed that needs to be saved.
-                */
-               if ( ! $this->manager->doing_ajax( 'customize_save' ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( $this->manager->settings_previewed() ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         foreach ( $settings as $setting ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $setting->preview();
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -506,7 +501,7 @@
</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">-                if ( ! $this->manager->doing_ajax( 'customize_save' ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( $this->manager->settings_previewed() ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         foreach ( $new_setting_ids as $new_setting_id ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $this->manager->get_setting( $new_setting_id )->preview();
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span></span></pre></div>
<a id="trunksrcwpincludesthemephp"></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/theme.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/theme.php   2017-08-02 05:10:05 UTC (rev 41204)
+++ trunk/src/wp-includes/theme.php     2017-08-02 05:34:32 UTC (rev 41205)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2816,8 +2816,24 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $messenger_channel = sanitize_key( $input_vars['customize_messenger_channel'] );
</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">+        /*
+        * Note that settings must be previewed even outside the customizer preview
+        * and also in the customizer pane itself. This is to enable loading an existing
+        * changeset into the customizer. Previewing the settings only has to be prevented
+        * here in the case of a customize_save action because this will cause WP to think
+        * there is nothing changed that needs to be saved.
+        */
+       $is_customize_save_action = (
+               wp_doing_ajax()
+               &&
+               isset( $_REQUEST['action'] )
+               &&
+               'customize_save' === wp_unslash( $_REQUEST['action'] )
+       );
+       $settings_previewed = ! $is_customize_save_action;
+
</ins><span class="cx" style="display: block; padding: 0 10px">         require_once ABSPATH . WPINC . '/class-wp-customize-manager.php';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $GLOBALS['wp_customize'] = new WP_Customize_Manager( compact( 'changeset_uuid', 'theme', 'messenger_channel' ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $GLOBALS['wp_customize'] = new WP_Customize_Manager( compact( 'changeset_uuid', 'theme', 'messenger_channel', 'settings_previewed' ) );
</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">@@ -2849,7 +2865,10 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        if ( empty( $wp_customize ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                require_once ABSPATH . WPINC . '/class-wp-customize-manager.php';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $wp_customize = new WP_Customize_Manager( array( 'changeset_uuid' => $changeset_post->post_name ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $wp_customize = new WP_Customize_Manager( array(
+                       'changeset_uuid' => $changeset_post->post_name,
+                       'settings_previewed' => false,
+               ) );
</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">        if ( ! did_action( 'customize_register' ) ) {
</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   2017-08-02 05:10:05 UTC (rev 41204)
+++ trunk/tests/phpunit/tests/customize/manager.php     2017-08-02 05:34:32 UTC (rev 41205)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -216,6 +216,20 @@
</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><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Test WP_Customize_Manager::settings_previewed().
+        *
+        * @ticket 39221
+        * @covers WP_Customize_Manager::settings_previewed()
+        */
+       function test_settings_previewed() {
+               $wp_customize = new WP_Customize_Manager( array( 'settings_previewed' => false ) );
+               $this->assertSame( false, $wp_customize->settings_previewed() );
+
+               $wp_customize = new WP_Customize_Manager();
+               $this->assertSame( true, $wp_customize->settings_previewed() );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Test WP_Customize_Manager::changeset_uuid().
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 30937
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1292,6 +1306,54 @@
</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><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Test saving settings by publishing a changeset outside of Customizer entirely.
+        *
+        * Widgets get their settings registered and previewed early in the admin,
+        * so this ensures that the previewing is bypassed when in the context of
+        * publishing
+        *
+        * @ticket 39221
+        * @covers _wp_customize_publish_changeset()
+        * @see WP_Customize_Widgets::schedule_customize_register()
+        * @see WP_Customize_Widgets::customize_register()
+        */
+       function test_wp_customize_publish_changeset() {
+               global $wp_customize;
+               $wp_customize = null;
+
+               // Set the admin current screen to cause WP_Customize_Widgets::schedule_customize_register() to do early setting registration.
+               set_current_screen( 'edit' );
+               $this->assertTrue( is_admin() );
+
+               $old_sidebars_widgets = get_option( 'sidebars_widgets' );
+               $new_sidebars_widgets = $old_sidebars_widgets;
+               $this->assertGreaterThan( 2, count( $new_sidebars_widgets['sidebar-1'] ) );
+               $new_sidebar_1 = array_reverse( $new_sidebars_widgets['sidebar-1'] );
+
+               $post_id = $this->factory()->post->create( array(
+                       'post_type' => 'customize_changeset',
+                       'post_status' => 'draft',
+                       'post_name' => wp_generate_uuid4(),
+                       'post_content' => wp_json_encode( array(
+                               'sidebars_widgets[sidebar-1]' => array(
+                                       'value' => $new_sidebar_1,
+                               ),
+                       ) ),
+               ) );
+
+               // Save the updated sidebar widgets into the options table by publishing the changeset.
+               wp_publish_post( $post_id );
+
+               // Make sure previewing filters were never added, since WP_Customize_Manager should be constructed with settings_previewed=false.
+               $this->assertFalse( has_filter( 'option_sidebars_widgets' ) );
+               $this->assertFalse( has_filter( 'default_option_sidebars_widgets' ) );
+
+               // Ensure that the value has actually been written to the DB.
+               $updated_sidebars_widgets = get_option( 'sidebars_widgets' );
+               $this->assertEquals( $new_sidebar_1, $updated_sidebars_widgets['sidebar-1'] );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Ensure that save_changeset_post method bails updating an underlying changeset which is invalid.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 41252
</span></span></pre>
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