WP/DeprecatedFunctions: update the functions list based on WP 6.9.0-RC2

Based on a scan of WP Core at commit WordPress/wordpress-develop@87e656 using a preliminary sniff created for issue 1803.

Includes tests.

Author: jrfnl

WordPress/Sniffs/WP/DeprecatedFunctionsSniff.php

@@ -43,7 +43,7 @@ final class DeprecatedFunctionsSniff extends AbstractFunctionRestrictionsSniff {
 	 * To retrieve a function list for comparison, the following tool is available:
 	 * https://github.com/JDGrimes/wp-deprecated-code-scanner
 	 *
-	 * {@internal To be updated after every major release. Last updated for WordPress 6.8.1.}
+	 * {@internal To be updated after every major release. Last updated for WordPress 6.9.0-RC2.}
 	 *
 	 * @var array
 	 */
@@ -1708,6 +1708,18 @@ final class DeprecatedFunctionsSniff extends AbstractFunctionRestrictionsSniff {
 			'alt'     => 'wp_enqueue_classic_theme_styles()',
 			'version' => '6.8.0',
 		),
+
+		// WP 6.9.0.
+		// Note: the deprecation of the (polyfilled) `utf8_encode()` and `utf8_decode()` functions is deliberately
+		// not listed here as these are polyfills for the PHP native functions, not WP native functions.
+		'seems_utf8' => array(
+			'alt'     => 'wp_is_valid_utf8()',
+			'version' => '6.9.0',
+		),
+		'wp_print_auto_sizes_contain_css_fix' => array(
+			'alt'     => 'wp_enqueue_img_auto_sizes_contain_css_fix()',
+			'version' => '6.9.0',
+		),
 	);
 
 	/**

WordPress/Tests/WP/DeprecatedFunctionsUnitTest.1.inc

@@ -441,3 +441,6 @@ wp_targeted_link_rel();
 wp_targeted_link_rel_callback();
 /* ============ WP 6.8 ============ */
 wp_add_editor_classic_theme_styles();
+/* ============ WP 6.9 ============ */
+seems_utf8();
+wp_print_auto_sizes_contain_css_fix();

WordPress/Tests/WP/DeprecatedFunctionsUnitTest.php

@@ -110,14 +110,15 @@ public function getWarningList( $testFile = '' ) {
 		switch ( $testFile ) {
 			case 'DeprecatedFunctionsUnitTest.1.inc':
 				$start_line = 426;
-				$end_line   = 443;
+				$end_line   = 446;
 				$warnings   = array_fill( $start_line, ( ( $end_line - $start_line ) + 1 ), 1 );
 
 				// Unset the lines related to version comments.
 				unset(
 					$warnings[429],
 					$warnings[432],
-					$warnings[442]
+					$warnings[442],
+					$warnings[444]
 				);
 
 				return $warnings;