From 1427d84abc3d772770b706fd77e69ad8affdead1 Mon Sep 17 00:00:00 2001
From: Weston Ruter <westonruter@git.wordpress.org>
Date: Fri, 29 Sep 2023 21:37:06 +0000
Subject: [PATCH] Customize: Harden and modernize URL manipulation in
 `WP_Customize_Manager::remove_frameless_preview_messenger_channel()`.

Since IE11 is no longer supported, the `URL` and `URLSearchParams` APIs can now be leveraged for simpler and more robust URL manipulation. This was done similarly in [56383] for `embed.js`.

Props nicolefurlan, dmsnell, westonruter.
Fixes #59480.


git-svn-id: https://develop.svn.wordpress.org/trunk@56749 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/class-wp-customize-manager.php | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/src/wp-includes/class-wp-customize-manager.php b/src/wp-includes/class-wp-customize-manager.php
index c1cf81f142..24f82510bd 100644
--- a/src/wp-includes/class-wp-customize-manager.php
+++ b/src/wp-includes/class-wp-customize-manager.php
@@ -2089,22 +2089,13 @@ final class WP_Customize_Manager {
 		?>
 		<script>
 		( function() {
-			var urlParser, oldQueryParams, newQueryParams, i;
 			if ( parent !== window ) {
 				return;
 			}
-			urlParser = document.createElement( 'a' );
-			urlParser.href = location.href;
-			oldQueryParams = urlParser.search.substr( 1 ).split( /&/ );
-			newQueryParams = [];
-			for ( i = 0; i < oldQueryParams.length; i += 1 ) {
-				if ( ! /^customize_messenger_channel=/.test( oldQueryParams[ i ] ) ) {
-					newQueryParams.push( oldQueryParams[ i ] );
-				}
-			}
-			urlParser.search = newQueryParams.join( '&' );
-			if ( urlParser.search !== location.search ) {
-				location.replace( urlParser.href );
+			const url = new URL( location.href );
+			if ( url.searchParams.has( 'customize_messenger_channel' ) ) {
+				url.searchParams.delete( 'customize_messenger_channel' );
+				location.replace( url );
 			}
 		} )();
 		</script>