Improved caching.

src/wp-includes/class-wp-theme-json-resolver.php

@@ -57,6 +57,14 @@ class WP_Theme_JSON_Resolver {
 	 */
 	protected static $theme = null;
 
+	/**
+	 * Container for data coming from the theme with supports.
+	 *
+	 * @since 6.1.2
+	 * @var WP_Theme_JSON
+	 */
+	protected static $with_theme_supports = null;
+
 	/**
 	 * Whether or not the theme supports theme.json.
 	 *
@@ -288,6 +296,10 @@ public static function get_theme_data( $deprecated = array(), $options = array()
 			return static::$theme;
 		}
 
+		if ( null !== static::$with_theme_supports ) {
+			return static::$with_theme_supports;
+		}
+
 		/*
 		 * We want the presets and settings declared in theme.json
 		 * to override the ones declared via theme supports.
@@ -323,9 +335,9 @@ public static function get_theme_data( $deprecated = array(), $options = array()
 			// Classic themes without a theme.json don't support global duotone.
 			$theme_support_data['settings']['color']['defaultDuotone'] = false;
 		}
-		$with_theme_supports = new WP_Theme_JSON( $theme_support_data );
-		$with_theme_supports->merge( static::$theme );
-		return $with_theme_supports;
+		static::$with_theme_supports = new WP_Theme_JSON( $theme_support_data );
+		static::$with_theme_supports->merge( static::$theme );
+		return static::$with_theme_supports;
 	}
 
 	/**
@@ -638,6 +650,8 @@ protected static function get_file_path_from_theme( $file_name, $template = fals
 	 *              and `$i18n_schema` variables to reset.
 	 * @since 6.1.0 Added the `$blocks` and `$blocks_cache` variables
 	 *              to reset.
+	 * @since 6.1.2 Added the `$with_theme_supports` variables
+	 *              to reset.
 	 */
 	public static function clean_cached_data() {
 		static::$core                     = null;
@@ -649,6 +663,7 @@ public static function clean_cached_data() {
 			'user'   => array(),
 		);
 		static::$theme                    = null;
+		static::$with_theme_supports      = null;
 		static::$user                     = null;
 		static::$user_custom_post_type_id = null;
 		static::$theme_has_support        = null;

src/wp-includes/default-filters.php

@@ -346,13 +346,15 @@
 add_action( 'init', '_register_core_block_patterns_and_categories' );
 add_action( 'init', 'check_theme_switched', 99 );
 add_action( 'init', array( 'WP_Block_Supports', 'init' ), 22 );
-add_action( 'switch_theme', array( 'WP_Theme_JSON_Resolver', 'clean_cached_data' ) );
-add_action( 'start_previewing_theme', array( 'WP_Theme_JSON_Resolver', 'clean_cached_data' ) );
 add_action( 'after_switch_theme', '_wp_menus_changed' );
 add_action( 'after_switch_theme', '_wp_sidebars_changed' );
 add_action( 'wp_print_styles', 'print_emoji_styles' );
 add_action( 'plugins_loaded', '_wp_theme_json_webfonts_handler' );
 
+foreach ( array( 'switch_theme', 'start_previewing_theme', 'add_theme_support', 'remove_theme_support' ) as $action ) {
+	add_action( $action, array( 'WP_Theme_JSON_Resolver', 'clean_cached_data' ) );
+}
+
 if ( isset( $_GET['replytocom'] ) ) {
 	add_filter( 'wp_robots', 'wp_robots_no_robots' );
 }

src/wp-includes/theme.php

@@ -2835,6 +2835,16 @@ function add_theme_support( $feature, ...$args ) {
 	}
 
 	$_wp_theme_features[ $feature ] = $args;
+
+	/**
+	 * Fires after theme support is added.
+	 *
+	 * @since 6.1.2
+	 *
+	 * @param string $feature The feature being added.
+	 * @param mixed  $args Optional extra arguments to pass along with certain features.
+	 */
+	do_action( 'add_theme_support', $feature, $args );
 }
 
 /**
@@ -3033,6 +3043,15 @@ function _remove_theme_support( $feature ) {
 
 	unset( $_wp_theme_features[ $feature ] );
 
+	/**
+	 * Fires after theme support is removed.
+	 *
+	 * @since 6.1.2
+	 *
+	 * @param string $feature The feature being added.
+	 */
+	do_action( 'remove_theme_support', $feature );
+
 	return true;
 }
 

tests/phpunit/tests/theme/wpGetGlobalStylesheet.php

@@ -37,6 +37,7 @@ public function set_up() {
 
 		// Clear caches.
 		wp_clean_themes_cache();
+		WP_Theme_JSON_Resolver::clean_cached_data();
 		unset( $GLOBALS['wp_themes'] );
 	}
 
@@ -49,6 +50,7 @@ public function tear_down() {
 		remove_filter( 'template_root', array( $this, 'filter_set_theme_root' ) );
 
 		wp_clean_themes_cache();
+		WP_Theme_JSON_Resolver::clean_cached_data();
 		unset( $GLOBALS['wp_themes'] );
 
 		parent::tear_down();