Cover WordPress 6.0 as well

lib/compat/wordpress-6.0/block-editor-settings.php

@@ -71,6 +71,7 @@ function gutenberg_get_block_editor_settings( $settings ) {
 		global $wp_version;
 		$is_wp_5_8 = version_compare( $wp_version, '5.8', '>=' ) && version_compare( $wp_version, '5.9', '<' );
 		$is_wp_5_9 = version_compare( $wp_version, '5.9', '>=' ) && version_compare( $wp_version, '6.0', '<' );
+		$is_wp_6_0 = version_compare( $wp_version, '6.0', '>=' );
 
 		// Make sure the styles array exists.
 		// In some contexts, like the navigation editor, it doesn't.
@@ -82,8 +83,9 @@ function gutenberg_get_block_editor_settings( $settings ) {
 		$styles_without_existing_global_styles = array();
 		foreach ( $settings['styles'] as $style ) {
 			if (
-				( $is_wp_5_8 && ! gutenberg_is_global_styles_in_5_8( $style ) ) ||
-				( $is_wp_5_9 && ! gutenberg_is_global_styles_in_5_9( $style ) )
+				( $is_wp_5_8 && ! gutenberg_is_global_styles_in_5_8( $style ) ) || // Can be removed when plugin minimum version is 5.9.
+				( $is_wp_5_9 && ! gutenberg_is_global_styles_in_5_9( $style ) ) || // Can be removed when plugin minimum version is 6.0.
+				( $is_wp_6_0 && ( ! isset( $style['isGlobalStyles'] ) || ! $style['isGlobalStyles'] ) )
 			) {
 				$styles_without_existing_global_styles[] = $style;
 			}