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wp-content/plugins/jetpack-boost/app/lib/critical-css/class-admin-bar-compatibility.php

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+<?php
+namespace Automattic\Jetpack_Boost\Lib\Critical_CSS;
+
+class Admin_Bar_Compatibility {
+
+	/**
+	 * Enforces the admin bar stylesheet to load late and synchronously
+	 * when the admin bar is present on the page.
+	 */
+	public static function init() {
+
+		// Force the Admin Bar to render in the footer.
+		remove_action( 'wp_body_open', 'wp_admin_bar_render', '0' );
+
+		add_filter( 'jetpack_boost_async_style', array( __CLASS__, 'enable_asynchronous_admin_bar' ), 10, 2 );
+		add_action( 'wp_before_admin_bar_render', array( __CLASS__, 'force_admin_bar_stylesheet' ) );
+		add_action( 'wp_head', array( __CLASS__, 'dequeue_admin_bar' ), 0 );
+	}
+
+	/**
+	 * Load the admin bar CSS synchronously.
+	 *
+	 * @param bool   $is_async Whether admin bar is async.
+	 * @param string $handle   Asset handle.
+	 *
+	 * @return bool
+	 */
+	public static function enable_asynchronous_admin_bar( $is_async, $handle ) {
+
+		if ( 'admin-bar' === $handle ) {
+			$is_async = false;
+		}
+
+		return $is_async;
+	}
+
+	/**
+	 * Dequeue the admin bar stylesheet, so that it's not printed early.
+	 *
+	 * @see     wp_head
+	 */
+	public static function dequeue_admin_bar() {
+		wp_dequeue_style( 'admin-bar' );
+	}
+
+	/**
+	 * Force the admin bar stylesheet to print right before the admin bar markup.
+	 *
+	 * @see     wp_before_admin_bar_render
+	 */
+	public static function force_admin_bar_stylesheet() {
+		wp_print_styles( 'admin-bar' );
+	}
+}