Editor: Fix how the Site Editor is linked to

- Add 'Edit site' to the top admin bar.
- Link to the Template and Template Part CPTs.
- Add deep link to the Global Styles UI.

Follows [52069].
See #54337.


git-svn-id: https://develop.svn.wordpress.org/trunk@52158 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/admin-bar.php

@@ -408,6 +408,33 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 	}
 }
 
+/**
+ * Adds the "Edit site" link to the Toolbar.
+ *
+ * @since 5.9.0
+ *
+ * @param WP_Admin_Bar $wp_admin_bar The WP_Admin_Bar instance.
+ */
+function wp_admin_bar_edit_site_menu( $wp_admin_bar ) {
+	// Don't show if a block theme is not activated.
+	if ( ! wp_is_block_template_theme() ) {
+		return;
+	}
+
+	// Don't show for users who can't edit theme options or when in the admin.
+	if ( ! current_user_can( 'edit_theme_options' ) || is_admin() ) {
+		return;
+	}
+
+	$wp_admin_bar->add_node(
+		array(
+			'id'    => 'site-editor',
+			'title' => __( 'Edit site' ),
+			'href'  => admin_url( 'site-editor.php' ),
+		)
+	);
+}
+
 /**
  * Adds the "Customize" link to the Toolbar.
  *
@@ -419,6 +446,11 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 function wp_admin_bar_customize_menu( $wp_admin_bar ) {
 	global $wp_customize;
 
+	// Don't show if a block theme is activated.
+	if ( wp_is_block_template_theme() ) {
+		return;
+	}
+
 	// Don't show for users who can't access the customizer or when in the admin.
 	if ( ! current_user_can( 'customize' ) || is_admin() ) {
 		return;
@@ -431,11 +463,6 @@ function wp_admin_bar_customize_menu( $wp_admin_bar ) {
 		return;
 	}
 
-	// Don't show if a block theme is activated.
-	if ( wp_is_block_template_theme() ) {
-		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 );