X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/af50974463450c98503e763a7836a50e260461a9..16e7b37c7914d753890c1a05a9335f3b43751eb8:/wp-includes/admin-bar.php

diff --git a/wp-includes/admin-bar.php b/wp-includes/admin-bar.php
index 32853c3a..83deb960 100644
--- a/wp-includes/admin-bar.php
+++ b/wp-includes/admin-bar.php
@@ -1,18 +1,23 @@
 <?php
 /**
- * Admin Bar
+ * Toolbar API: Top-level Toolbar functionality
  *
- * This code handles the building and rendering of the press bar.
+ * @package WordPress
+ * @subpackage Toolbar
+ * @since 3.1.0
  */
 
 /**
  * Instantiate the admin bar object and set it up as a global for access elsewhere.
  *
  * UNHOOKING THIS FUNCTION WILL NOT PROPERLY REMOVE THE ADMIN BAR.
- * For that, use show_admin_bar(false) or the 'show_admin_bar' filter.
+ * For that, use show_admin_bar(false) or the {@see 'show_admin_bar'} filter.
  *
  * @since 3.1.0
  * @access private
+ *
+ * @global WP_Admin_Bar $wp_admin_bar
+ *
  * @return bool Whether the admin bar was successfully initialized.
  */
 function _wp_admin_bar_init() {
@@ -22,12 +27,12 @@ function _wp_admin_bar_init() {
 		return false;
 
 	/* Load the admin bar class code ready for instantiation */
-	require( ABSPATH . WPINC . '/class-wp-admin-bar.php' );
+	require_once( ABSPATH . WPINC . '/class-wp-admin-bar.php' );
 
 	/* Instantiate the admin bar */
 
 	/**
-	 * Filter the admin bar class to instantiate.
+	 * Filters the admin bar class to instantiate.
 	 *
 	 * @since 3.1.0
 	 *
@@ -44,26 +49,27 @@ function _wp_admin_bar_init() {
 
 	return true;
 }
-// Don't remove. Wrong way to disable.
-add_action( 'template_redirect', '_wp_admin_bar_init', 0 );
-add_action( 'admin_init', '_wp_admin_bar_init' );
 
 /**
- * Render the admin bar to the page based on the $wp_admin_bar->menu member var.
- * This is called very late on the footer actions so that it will render after anything else being
- * added to the footer.
+ * Renders the admin bar to the page based on the $wp_admin_bar->menu member var.
  *
- * It includes the action "admin_bar_menu" which should be used to hook in and
- * add new menus to the admin bar. That way you can be sure that you are adding at most optimal point,
- * right before the admin bar is rendered. This also gives you access to the $post global, among others.
+ * This is called very late on the footer actions so that it will render after
+ * anything else being added to the footer.
+ *
+ * It includes the {@see 'admin_bar_menu'} action which should be used to hook in and
+ * add new menus to the admin bar. That way you can be sure that you are adding at most
+ * optimal point, right before the admin bar is rendered. This also gives you access to
+ * the `$post` global, among others.
  *
  * @since 3.1.0
+ *
+ * @global WP_Admin_Bar $wp_admin_bar
  */
 function wp_admin_bar_render() {
 	global $wp_admin_bar;
 
 	if ( ! is_admin_bar_showing() || ! is_object( $wp_admin_bar ) )
-		return false;
+		return;
 
 	/**
 	 * Load all necessary admin bar items.
@@ -92,8 +98,6 @@ function wp_admin_bar_render() {
 	 */
 	do_action( 'wp_after_admin_bar_render' );
 }
-add_action( 'wp_footer', 'wp_admin_bar_render', 1000 );
-add_action( 'in_admin_header', 'wp_admin_bar_render', 0 );
 
 /**
  * Add the WordPress logo menu.
@@ -103,22 +107,36 @@ add_action( 'in_admin_header', 'wp_admin_bar_render', 0 );
  * @param WP_Admin_Bar $wp_admin_bar
  */
 function wp_admin_bar_wp_menu( $wp_admin_bar ) {
-	$wp_admin_bar->add_menu( array(
+	if ( current_user_can( 'read' ) ) {
+		$about_url = self_admin_url( 'about.php' );
+	} elseif ( is_multisite() ) {
+		$about_url = get_dashboard_url( get_current_user_id(), 'about.php' );
+	} else {
+		$about_url = false;
+	}
+
+	$wp_logo_menu_args = array(
 		'id'    => 'wp-logo',
-		'title' => '<span class="ab-icon"></span>',
-		'href'  => self_admin_url( 'about.php' ),
-		'meta'  => array(
-			'title' => __('About WordPress'),
-		),
-	) );
+		'title' => '<span class="ab-icon"></span><span class="screen-reader-text">' . __( 'About WordPress' ) . '</span>',
+		'href'  => $about_url,
+	);
+
+	// Set tabindex="0" to make sub menus accessible when no URL is available.
+	if ( ! $about_url ) {
+		$wp_logo_menu_args['meta'] = array(
+			'tabindex' => 0,
+		);
+	}
+
+	$wp_admin_bar->add_menu( $wp_logo_menu_args );
 
-	if ( is_user_logged_in() ) {
+	if ( $about_url ) {
 		// Add "About WordPress" link
 		$wp_admin_bar->add_menu( array(
 			'parent' => 'wp-logo',
 			'id'     => 'about',
 			'title'  => __('About WordPress'),
-			'href'  => self_admin_url( 'about.php' ),
+			'href'   => $about_url,
 		) );
 	}
 
@@ -135,7 +153,7 @@ function wp_admin_bar_wp_menu( $wp_admin_bar ) {
 		'parent'    => 'wp-logo-external',
 		'id'        => 'documentation',
 		'title'     => __('Documentation'),
-		'href'      => __('http://codex.wordpress.org/'),
+		'href'      => __('https://codex.wordpress.org/'),
 	) );
 
 	// Add forums link
@@ -182,13 +200,21 @@ function wp_admin_bar_sidebar_toggle( $wp_admin_bar ) {
 function wp_admin_bar_my_account_item( $wp_admin_bar ) {
 	$user_id      = get_current_user_id();
 	$current_user = wp_get_current_user();
-	$profile_url  = get_edit_profile_url( $user_id );
 
 	if ( ! $user_id )
 		return;
 
+	if ( current_user_can( 'read' ) ) {
+		$profile_url = get_edit_profile_url( $user_id );
+	} elseif ( is_multisite() ) {
+		$profile_url = get_dashboard_url( $user_id, 'profile.php' );
+	} else {
+		$profile_url = false;
+	}
+
 	$avatar = get_avatar( $user_id, 26 );
-	$howdy  = sprintf( __('Howdy, %1$s'), $current_user->display_name );
+	/* translators: %s: current user's display name */
+	$howdy  = sprintf( __( 'Howdy, %s' ), $current_user->display_name );
 	$class  = empty( $avatar ) ? '' : 'with-avatar';
 
 	$wp_admin_bar->add_menu( array(
@@ -198,7 +224,6 @@ function wp_admin_bar_my_account_item( $wp_admin_bar ) {
 		'href'      => $profile_url,
 		'meta'      => array(
 			'class'     => $class,
-			'title'     => __('My Account'),
 		),
 	) );
 }
@@ -213,11 +238,18 @@ function wp_admin_bar_my_account_item( $wp_admin_bar ) {
 function wp_admin_bar_my_account_menu( $wp_admin_bar ) {
 	$user_id      = get_current_user_id();
 	$current_user = wp_get_current_user();
-	$profile_url  = get_edit_profile_url( $user_id );
 
 	if ( ! $user_id )
 		return;
 
+	if ( current_user_can( 'read' ) ) {
+		$profile_url = get_edit_profile_url( $user_id );
+	} elseif ( is_multisite() ) {
+		$profile_url = get_dashboard_url( $user_id, 'profile.php' );
+	} else {
+		$profile_url = false;
+	}
+
 	$wp_admin_bar->add_group( array(
 		'parent' => 'my-account',
 		'id'     => 'user-actions',
@@ -238,12 +270,16 @@ function wp_admin_bar_my_account_menu( $wp_admin_bar ) {
 			'tabindex' => -1,
 		),
 	) );
-	$wp_admin_bar->add_menu( array(
-		'parent' => 'user-actions',
-		'id'     => 'edit-profile',
-		'title'  => __( 'Edit My Profile' ),
-		'href' => $profile_url,
-	) );
+
+	if ( false !== $profile_url ) {
+		$wp_admin_bar->add_menu( array(
+			'parent' => 'user-actions',
+			'id'     => 'edit-profile',
+			'title'  => __( 'Edit My Profile' ),
+			'href'   => $profile_url,
+		) );
+	}
+
 	$wp_admin_bar->add_menu( array(
 		'parent' => 'user-actions',
 		'id'     => 'logout',
@@ -275,9 +311,11 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 	}
 
 	if ( is_network_admin() ) {
-		$blogname = sprintf( __('Network Admin: %s'), esc_html( get_current_site()->site_name ) );
+		/* translators: %s: site name */
+		$blogname = sprintf( __( 'Network Admin: %s' ), esc_html( get_network()->site_name ) );
 	} elseif ( is_user_admin() ) {
-		$blogname = sprintf( __('Global Dashboard: %s'), esc_html( get_current_site()->site_name ) );
+		/* translators: %s: site name */
+		$blogname = sprintf( __( 'User Dashboard: %s' ), esc_html( get_network()->site_name ) );
 	}
 
 	$title = wp_html_excerpt( $blogname, 40, '&hellip;' );
@@ -285,7 +323,7 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 	$wp_admin_bar->add_menu( array(
 		'id'    => 'site-name',
 		'title' => $title,
-		'href'  => is_admin() ? home_url( '/' ) : admin_url(),
+		'href'  => ( is_admin() || ! current_user_can( 'read' ) ) ? home_url( '/' ) : admin_url(),
 	) );
 
 	// Create submenu items.
@@ -308,7 +346,7 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 			) );
 		}
 
-	} else {
+	} else if ( current_user_can( 'read' ) ) {
 		// We're on the front end, link to the Dashboard.
 		$wp_admin_bar->add_menu( array(
 			'parent' => 'site-name',
@@ -322,6 +360,48 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 	}
 }
 
+/**
+ * Adds the "Customize" link to the Toolbar.
+ *
+ * @since 4.3.0
+ *
+ * @param WP_Admin_Bar $wp_admin_bar WP_Admin_Bar instance.
+ * @global WP_Customize_Manager $wp_customize
+ */
+function wp_admin_bar_customize_menu( $wp_admin_bar ) {
+	global $wp_customize;
+
+	// Don't show for users who can't access the customizer or when in the admin.
+	if ( ! current_user_can( 'customize' ) || is_admin() ) {
+		return;
+	}
+
+	// Don't show if the user cannot edit a given customize_changeset post currently being previewed.
+	if ( is_customize_preview() && $wp_customize->changeset_post_id() && ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $wp_customize->changeset_post_id() ) ) {
+		return;
+	}
+
+	$current_url = ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
+	if ( is_customize_preview() && $wp_customize->changeset_uuid() ) {
+		$current_url = remove_query_arg( 'customize_changeset_uuid', $current_url );
+	}
+
+	$customize_url = add_query_arg( 'url', urlencode( $current_url ), wp_customize_url() );
+	if ( is_customize_preview() ) {
+		$customize_url = add_query_arg( array( 'changeset_uuid' => $wp_customize->changeset_uuid() ), $customize_url );
+	}
+
+	$wp_admin_bar->add_menu( array(
+		'id'     => 'customize',
+		'title'  => __( 'Customize' ),
+		'href'   => $customize_url,
+		'meta'   => array(
+			'class' => 'hide-if-no-customize',
+		),
+	) );
+	add_action( 'wp_before_admin_bar_render', 'wp_customize_support_script' );
+}
+
 /**
  * Add the "My Sites/[Site Name]" menu and all submenus.
  *
@@ -338,10 +418,16 @@ function wp_admin_bar_my_sites_menu( $wp_admin_bar ) {
 	if ( count( $wp_admin_bar->user->blogs ) < 1 && ! is_super_admin() )
 		return;
 
+	if ( $wp_admin_bar->user->active_blog ) {
+		$my_sites_url = get_admin_url( $wp_admin_bar->user->active_blog->blog_id, 'my-sites.php' );
+	} else {
+		$my_sites_url = admin_url( 'my-sites.php' );
+	}
+
 	$wp_admin_bar->add_menu( array(
 		'id'    => 'my-sites',
 		'title' => __( 'My Sites' ),
-		'href'  => admin_url( 'my-sites.php' ),
+		'href'  => $my_sites_url,
 	) );
 
 	if ( is_super_admin() ) {
@@ -387,6 +473,12 @@ function wp_admin_bar_my_sites_menu( $wp_admin_bar ) {
 			'title'  => __( 'Plugins' ),
 			'href'   => network_admin_url( 'plugins.php' ),
 		) );
+		$wp_admin_bar->add_menu( array(
+			'parent' => 'network-admin',
+			'id'     => 'network-admin-o',
+			'title'  => __( 'Settings' ),
+			'href'   => network_admin_url( 'settings.php' ),
+		) );
 	}
 
 	// Add site links
@@ -483,6 +575,9 @@ function wp_admin_bar_shortlink_menu( $wp_admin_bar ) {
  *
  * @since 3.1.0
  *
+ * @global WP_Term  $tag
+ * @global WP_Query $wp_the_query
+ *
  * @param WP_Admin_Bar $wp_admin_bar
  */
 function wp_admin_bar_edit_menu( $wp_admin_bar ) {
@@ -499,10 +594,8 @@ function wp_admin_bar_edit_menu( $wp_admin_bar ) {
 			&& ( $post_type_object->public )
 			&& ( $post_type_object->show_in_admin_bar ) )
 		{
-			if( 'draft' == $post->post_status ) {
-				$preview_link = set_url_scheme( get_permalink( $post->ID ) );
-				/** This filter is documented in wp-admin/includes/meta-boxes.php */
-				$preview_link = apply_filters( 'preview_post_link', add_query_arg( 'preview', 'true', $preview_link ), $post );
+			if ( 'draft' == $post->post_status ) {
+				$preview_link = get_preview_post_link( $post );
 				$wp_admin_bar->add_menu( array(
 					'id' => 'preview',
 					'title' => $post_type_object->labels->view_item,
@@ -516,8 +609,20 @@ function wp_admin_bar_edit_menu( $wp_admin_bar ) {
 					'href' => get_permalink( $post->ID )
 				) );
 			}
-		} elseif ( 'edit-tags' == $current_screen->base
-			&& isset( $tag ) && is_object( $tag )
+		} elseif ( 'edit' == $current_screen->base
+ 			&& ( $post_type_object = get_post_type_object( $current_screen->post_type ) )
+ 			&& ( $post_type_object->public )
+ 			&& ( $post_type_object->show_in_admin_bar )
+ 			&& ( get_post_type_archive_link( $post_type_object->name ) )
+			&& ! ( 'post' === $post_type_object->name && 'posts' === get_option( 'show_on_front' ) ) )
+ 		{
+ 			$wp_admin_bar->add_node( array(
+ 				'id' => 'archive',
+ 				'title' => $post_type_object->labels->view_items,
+ 				'href' => get_post_type_archive_link( $current_screen->post_type )
+ 			) );
+		} elseif ( 'term' == $current_screen->base
+			&& isset( $tag ) && is_object( $tag ) && ! is_wp_error( $tag )
 			&& ( $tax = get_taxonomy( $tag->taxonomy ) )
 			&& $tax->public )
 		{
@@ -536,7 +641,7 @@ function wp_admin_bar_edit_menu( $wp_admin_bar ) {
 		if ( ! empty( $current_object->post_type )
 			&& ( $post_type_object = get_post_type_object( $current_object->post_type ) )
 			&& current_user_can( 'edit_post', $current_object->ID )
-			&& $post_type_object->show_ui && $post_type_object->show_in_admin_bar
+			&& $post_type_object->show_in_admin_bar
 			&& $edit_post_link = get_edit_post_link( $current_object->ID ) )
 		{
 			$wp_admin_bar->add_menu( array(
@@ -546,8 +651,7 @@ function wp_admin_bar_edit_menu( $wp_admin_bar ) {
 			) );
 		} elseif ( ! empty( $current_object->taxonomy )
 			&& ( $tax = get_taxonomy( $current_object->taxonomy ) )
-			&& current_user_can( $tax->cap->edit_terms )
-			&& $tax->show_ui
+			&& current_user_can( 'edit_term', $current_object->term_id )
 			&& $edit_term_link = get_edit_term_link( $current_object->term_id, $current_object->taxonomy ) )
 		{
 			$wp_admin_bar->add_menu( array(
@@ -609,9 +713,6 @@ function wp_admin_bar_new_content_menu( $wp_admin_bar ) {
 		'id'    => 'new-content',
 		'title' => $title,
 		'href'  => admin_url( current( array_keys( $actions ) ) ),
-		'meta'  => array(
-			'title' => _x( 'Add New', 'admin bar menu group label' ),
-		),
 	) );
 
 	foreach ( $actions as $link => $action ) {
@@ -639,16 +740,16 @@ function wp_admin_bar_comments_menu( $wp_admin_bar ) {
 
 	$awaiting_mod = wp_count_comments();
 	$awaiting_mod = $awaiting_mod->moderated;
-	$awaiting_title = esc_attr( sprintf( _n( '%s comment awaiting moderation', '%s comments awaiting moderation', $awaiting_mod ), number_format_i18n( $awaiting_mod ) ) );
+	$awaiting_text = sprintf( _n( '%s comment awaiting moderation', '%s comments awaiting moderation', $awaiting_mod ), number_format_i18n( $awaiting_mod ) );
 
 	$icon  = '<span class="ab-icon"></span>';
-	$title = '<span id="ab-awaiting-mod" class="ab-label awaiting-mod pending-count count-' . $awaiting_mod . '">' . number_format_i18n( $awaiting_mod ) . '</span>';
+	$title = '<span class="ab-label awaiting-mod pending-count count-' . $awaiting_mod . '" aria-hidden="true">' . number_format_i18n( $awaiting_mod ) . '</span>';
+	$title .= '<span class="screen-reader-text">' . $awaiting_text . '</span>';
 
 	$wp_admin_bar->add_menu( array(
 		'id'    => 'comments',
 		'title' => $icon . $title,
 		'href'  => admin_url('edit-comments.php'),
-		'meta'  => array( 'title' => $awaiting_title ),
 	) );
 }
 
@@ -662,30 +763,28 @@ function wp_admin_bar_comments_menu( $wp_admin_bar ) {
 function wp_admin_bar_appearance_menu( $wp_admin_bar ) {
 	$wp_admin_bar->add_group( array( 'parent' => 'site-name', 'id' => 'appearance' ) );
 
-	if ( current_user_can( 'switch_themes' ) || current_user_can( 'edit_theme_options' ) )
-		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'themes', 'title' => __('Themes'), 'href' => admin_url('themes.php') ) );
+	if ( current_user_can( 'switch_themes' ) ) {
+		$wp_admin_bar->add_menu( array(
+			'parent' => 'appearance',
+			'id'     => 'themes',
+			'title'  => __( 'Themes' ),
+			'href'   => admin_url( 'themes.php' ),
+		) );
+	}
 
-	if ( ! current_user_can( 'edit_theme_options' ) )
+	if ( ! current_user_can( 'edit_theme_options' ) ) {
 		return;
+	}
 
-	$current_url = ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
-	$customize_url = add_query_arg( 'url', urlencode( $current_url ), wp_customize_url() );
-	if ( current_user_can( 'customize' ) ) {
+	if ( current_theme_supports( 'widgets' )  ) {
 		$wp_admin_bar->add_menu( array(
 			'parent' => 'appearance',
-			'id'     => 'customize',
-			'title'  => __('Customize'),
-			'href'   => $customize_url,
-			'meta'   => array(
-				'class' => 'hide-if-no-customize',
-			),
+			'id'     => 'widgets',
+			'title'  => __( 'Widgets' ),
+			'href'   => admin_url( 'widgets.php' ),
 		) );
-		add_action( 'wp_before_admin_bar_render', 'wp_customize_support_script' );
 	}
 
-	if ( current_theme_supports( 'widgets' )  )
-		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'widgets', 'title' => __('Widgets'), 'href' => admin_url('widgets.php') ) );
-
 	if ( current_theme_supports( 'menus' ) || current_theme_supports( 'widgets' ) )
 		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'menus', 'title' => __('Menus'), 'href' => admin_url('nav-menus.php') ) );
 
@@ -699,18 +798,6 @@ function wp_admin_bar_appearance_menu( $wp_admin_bar ) {
 				'class' => 'hide-if-customize',
 			),
 		) );
-
-		if ( current_user_can( 'customize' ) ) {
-			$wp_admin_bar->add_menu( array(
-				'parent' => 'appearance',
-				'id'     => 'customize-background',
-				'title'  => __( 'Background' ),
-				'href'   => add_query_arg( urlencode( 'autofocus[control]' ), 'background_image', $customize_url ), // urlencode() needed due to #16859
-				'meta'   => array(
-					'class' => 'hide-if-no-customize',
-				),
-			) );
-		}
 	}
 
 	if ( current_theme_supports( 'custom-header' ) ) {
@@ -723,18 +810,6 @@ function wp_admin_bar_appearance_menu( $wp_admin_bar ) {
 				'class' => 'hide-if-customize',
 			),
 		) );
-
-		if ( current_user_can( 'customize' ) ) {
-			$wp_admin_bar->add_menu( array(
-				'parent' => 'appearance',
-				'id'     => 'customize-header',
-				'title'  => __( 'Header' ),
-				'href'   => add_query_arg( urlencode( 'autofocus[control]' ), 'header_image', $customize_url ), // urlencode() needed due to #16859
-				'meta'   => array(
-					'class' => 'hide-if-no-customize',
-				),
-			) );
-		}
 	}
 
 }
@@ -779,6 +854,7 @@ function wp_admin_bar_search_menu( $wp_admin_bar ) {
 
 	$form  = '<form action="' . esc_url( home_url( '/' ) ) . '" method="get" id="adminbarsearch">';
 	$form .= '<input class="adminbar-input" name="s" id="adminbar-search" type="text" value="" maxlength="150" />';
+	$form .= '<label for="adminbar-search" class="screen-reader-text">' . __( 'Search' ) . '</label>';
 	$form .= '<input type="submit" class="adminbar-button" value="' . __('Search') . '"/>';
 	$form .= '</form>';
 
@@ -845,14 +921,16 @@ function _admin_bar_bump_cb() { ?>
 }
 
 /**
- * Set the display status of the admin bar.
+ * Sets the display status of the admin bar.
  *
- * This can be called immediately upon plugin load. It does not need to be called from a function hooked to the init action.
+ * This can be called immediately upon plugin load. It does not need to be called
+ * from a function hooked to the {@see 'init'} action.
  *
  * @since 3.1.0
  *
+ * @global bool $show_admin_bar
+ *
  * @param bool $show Whether to allow the admin bar to show.
- * @return void
  */
 function show_admin_bar( $show ) {
 	global $show_admin_bar;
@@ -864,6 +942,9 @@ function show_admin_bar( $show ) {
  *
  * @since 3.1.0
  *
+ * @global bool   $show_admin_bar
+ * @global string $pagenow
+ *
  * @return bool Whether the admin bar should be showing.
  */
 function is_admin_bar_showing() {
@@ -873,6 +954,10 @@ function is_admin_bar_showing() {
 	if ( defined('XMLRPC_REQUEST') || defined('DOING_AJAX') || defined('IFRAME_REQUEST') )
 		return false;
 
+	if ( is_embed() ) {
+		return false;
+	}
+
 	// Integrated into the admin.
 	if ( is_admin() )
 		return true;
@@ -886,7 +971,7 @@ function is_admin_bar_showing() {
 	}
 
 	/**
-	 * Filter whether to show the admin bar.
+	 * Filters whether to show the admin bar.
 	 *
 	 * Returning false to this hook is the recommended way to hide the admin bar.
 	 * The user's display preference is used for logged in users.