Update tracked WordPress core files

wordpress/wp-signup.php

@@ -63,9 +63,10 @@ do_action( 'before_signup_header' );
  */
 function wpmu_signup_stylesheet() {
 	?>
-	<style type="text/css">
-		.mu_register { width: 90%; margin: 0 auto; }
-		.mu_register form { margin-top: 2em; }
+	<style>
+		.mu_register { width: 90%; margin: 0 auto; text-align: start; padding: 24px; box-sizing: border-box; }
+		.mu_register p { font-size: 18px; }
+		.mu_register form { margin: 24px 0; }
 		.mu_register fieldset,
 			.mu_register legend { margin: 0; padding: 0; border: none; }
 		.mu_register .error { padding: 10px; color: #333; background: #ffebe8; border: 1px solid #c00; }
@@ -74,6 +75,8 @@ function wpmu_signup_stylesheet() {
 			.mu_register #user_email,
 			.mu_register #blogname,
 			.mu_register #user_name { width: 100%; font-size: 24px; margin: 5px 0; box-sizing: border-box; }
+		.mu_register input[type="email"],
+			.mu_register #user_name { direction: ltr; }
 		.mu_register #site-language { display: block; }
 		.mu_register .prefix_address,
 			.mu_register .suffix_address { font-size: 18px; display: inline-block; direction: ltr; }
@@ -976,7 +979,7 @@ if ( 'none' === $active_signup ) {
 	/* translators: %s: Login URL. */
 	printf( __( 'You must first <a href="%s">log in</a>, and then you can create a new site.' ), $login_url );
 } else {
-	$stage = isset( $_POST['stage'] ) ? $_POST['stage'] : 'default';
+	$stage = $_POST['stage'] ?? 'default';
 	switch ( $stage ) {
 		case 'validate-user-signup':
 			if ( 'all' === $active_signup
@@ -1000,7 +1003,7 @@ if ( 'none' === $active_signup ) {
 			break;
 		case 'default':
 		default:
-			$user_email = isset( $_POST['user_email'] ) ? $_POST['user_email'] : '';
+			$user_email = $_POST['user_email'] ?? '';
 			/**
 			 * Fires when the site sign-up form is sent.
 			 *