From 5ce11d98232acd374b2ebef1c8da5310d8bb824f Mon Sep 17 00:00:00 2001
From: tellthemachines <tellthemachines@users.noreply.github.com>
Date: Wed, 10 Jul 2024 16:58:33 +1000
Subject: [PATCH] Only add customizer additional CSS to global styles in block
 themes (#63331)

Co-authored-by: tellthemachines <isabel_brison@git.wordpress.org>
Co-authored-by: aaronrobertshaw <aaronrobertshaw@git.wordpress.org>
Co-authored-by: andrewserong <andrewserong@git.wordpress.org>
---
 lib/script-loader.php | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/lib/script-loader.php b/lib/script-loader.php
index 59df13556e9cfc..51346e57b4a73a 100644
--- a/lib/script-loader.php
+++ b/lib/script-loader.php
@@ -44,17 +44,19 @@ function gutenberg_enqueue_global_styles() {
 
 	$stylesheet = gutenberg_get_global_stylesheet();
 
-	/*
-	 * Dequeue the Customizer's custom CSS
-	 * and add it before the global styles custom CSS.
-	 */
-	remove_action( 'wp_head', 'wp_custom_css_cb', 101 );
-	// Get the custom CSS from the Customizer and add it to the global stylesheet.
-	$custom_css  = wp_get_custom_css();
-	$stylesheet .= $custom_css;
+	if ( $is_block_theme ) {
+		/*
+		 * Dequeue the Customizer's custom CSS
+		 * and add it before the global styles custom CSS.
+		 */
+		remove_action( 'wp_head', 'wp_custom_css_cb', 101 );
+		// Get the custom CSS from the Customizer and add it to the global stylesheet.
+		$custom_css  = wp_get_custom_css();
+		$stylesheet .= $custom_css;
 
-	// Add the global styles custom CSS at the end.
-	$stylesheet .= gutenberg_get_global_stylesheet( array( 'custom-css' ) );
+		// Add the global styles custom CSS at the end.
+		$stylesheet .= gutenberg_get_global_stylesheet( array( 'custom-css' ) );
+	}
 
 	if ( empty( $stylesheet ) ) {
 		return;