Editor: Use static closures to avoid memory leaks.

Backports Gutenberg changes from WordPress/gutenberg#50723.

Amends [55822].

Fixes #58323.
Props westonruter, spacedmonkey, flixos90. 


git-svn-id: https://develop.svn.wordpress.org/trunk@56038 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -2423,7 +2423,7 @@ static function( $split_feature_selector ) use ( $clean_style_variation_selector
 		$pseudo_matches = array_values(
 			array_filter(
 				$element_pseudo_allowed,
-				function( $pseudo_selector ) use ( $selector ) {
+				static function( $pseudo_selector ) use ( $selector ) {
 					return str_contains( $selector, $pseudo_selector );
 				}
 			)

src/wp-includes/global-styles-and-settings.php

@@ -370,7 +370,7 @@ function wp_add_global_styles_for_blocks() {
 			$result = array_values(
 				array_filter(
 					$metadata['path'],
-					function ( $item ) {
+					static function ( $item ) {
 						if ( str_contains( $item, 'core/' ) ) {
 							return true;
 						}

tests/phpunit/tests/media.php

@@ -4217,7 +4217,7 @@ public function test_wp_get_loading_attr_default_should_return_false_for_special
 		$result = null;
 		add_filter(
 			'the_content',
-			function( $content ) use ( &$result, $context ) {
+			static function( $content ) use ( &$result, $context ) {
 				$result = wp_get_loading_attr_default( $context );
 				return $content;
 			}