Editor: A11y: Set ARIA attributes for Classic Editor link inserter.

Set `aria-modal` and `aria-hidden` attributes when the Classic Editor link inserter modal is active, so that content behind the modal will be properly treated as inert when interacting with the modal.

Props lyonmuller, jwgoedert, sabernhardt, alexstine, afercia, rajinsharwar, rcreators, audrasjb, hmbashar, joedolson.
Fixes #60799.
Built from https://develop.svn.wordpress.org/trunk@58450


git-svn-id: http://core.svn.wordpress.org/trunk@57899 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-editor.php

@@ -1875,7 +1875,7 @@ public static function wp_link_dialog() {
 		// `display: none` is required here, see #WP27605.
 		?>
 		<div id="wp-link-backdrop" style="display: none"></div>
-		<div id="wp-link-wrap" class="wp-core-ui" style="display: none" role="dialog" aria-labelledby="link-modal-title">
+		<div id="wp-link-wrap" class="wp-core-ui" style="display: none" role="dialog" aria-modal="true" aria-labelledby="link-modal-title">
 		<form id="wp-link" tabindex="-1">
 		<?php wp_nonce_field( 'internal-linking', '_ajax_linking_nonce', false ); ?>
 		<h1 id="link-modal-title"><?php _e( 'Insert/edit link' ); ?></h1>

wp-includes/js/wplink.js

@@ -105,6 +105,7 @@
 			var ed,
 				$body = $( document.body );
 
+			$( '#wpwrap' ).attr( 'aria-hidden', 'true' );
 			$body.addClass( 'modal-open' );
 			wpLink.modalOpen = true;
 
@@ -281,6 +282,7 @@
 
 		close: function( reset ) {
 			$( document.body ).removeClass( 'modal-open' );
+			$( '#wpwrap' ).removeAttr( 'aria-hidden' );
 			wpLink.modalOpen = false;
 
 			if ( reset !== 'noReset' ) {