Editor: Correctly merge custom CSS into global styles

Update the get_block_editor_settings function and merge custom CSS directly into the $global_styles array.

Fixes #57833.
Props Mamaduka, poena, sakibmd.


Built from https://develop.svn.wordpress.org/trunk@55438


git-svn-id: http://core.svn.wordpress.org/trunk@54971 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/block-editor.php

@@ -418,7 +418,7 @@ function get_block_editor_settings( array $custom_settings, $block_editor_contex
 		 * Add the custom CSS as a separate stylesheet so any invalid CSS
 		 * entered by users does not break other global styles.
 		 */
-		$editor_settings['styles'][] = array(
+		$global_styles[] = array(
 			'css'            => wp_get_global_styles_custom_css(),
 			'__unstableType' => 'user',
 			'isGlobalStyles' => true,

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-beta3-55437';
+$wp_version = '6.2-beta3-55438';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.