diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-admin/includes/class-theme-upgrader-skin.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-admin/includes/class-theme-upgrader-skin.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,89 @@
+<?php
+/**
+ * Upgrader API: Theme_Upgrader_Skin class
+ *
+ * @package WordPress
+ * @subpackage Upgrader
+ * @since 4.6.0
+ */
+
+/**
+ * Theme Upgrader Skin for WordPress Theme Upgrades.
+ *
+ * @since 2.8.0
+ * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader-skins.php.
+ *
+ * @see WP_Upgrader_Skin
+ */
+class Theme_Upgrader_Skin extends WP_Upgrader_Skin {
+	public $theme = '';
+
+	/**
+	 *
+	 * @param array $args
+	 */
+	public function __construct($args = array()) {
+		$defaults = array( 'url' => '', 'theme' => '', 'nonce' => '', 'title' => __('Update Theme') );
+		$args = wp_parse_args($args, $defaults);
+
+		$this->theme = $args['theme'];
+
+		parent::__construct($args);
+	}
+
+	/**
+	 */
+	public function after() {
+		$this->decrement_update_count( 'theme' );
+
+		$update_actions = array();
+		if ( ! empty( $this->upgrader->result['destination_name'] ) && $theme_info = $this->upgrader->theme_info() ) {
+			$name       = $theme_info->display('Name');
+			$stylesheet = $this->upgrader->result['destination_name'];
+			$template   = $theme_info->get_template();
+
+			$activate_link = add_query_arg( array(
+				'action'     => 'activate',
+				'template'   => urlencode( $template ),
+				'stylesheet' => urlencode( $stylesheet ),
+			), admin_url('themes.php') );
+			$activate_link = wp_nonce_url( $activate_link, 'switch-theme_' . $stylesheet );
+
+			$customize_url = add_query_arg(
+				array(
+					'theme' => urlencode( $stylesheet ),
+					'return' => urlencode( admin_url( 'themes.php' ) ),
+				),
+				admin_url( 'customize.php' )
+			);
+			if ( get_stylesheet() == $stylesheet ) {
+				if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
+					$update_actions['preview']  = '<a href="' . esc_url( $customize_url ) . '" class="hide-if-no-customize load-customize"><span aria-hidden="true">' . __( 'Customize' ) . '</span><span class="screen-reader-text">' . sprintf( __( 'Customize &#8220;%s&#8221;' ), $name ) . '</span></a>';
+				}
+			} elseif ( current_user_can( 'switch_themes' ) ) {
+				if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
+					$update_actions['preview'] = '<a href="' . esc_url( $customize_url ) . '" class="hide-if-no-customize load-customize"><span aria-hidden="true">' . __( 'Live Preview' ) . '</span><span class="screen-reader-text">' . sprintf( __( 'Live Preview &#8220;%s&#8221;' ), $name ) . '</span></a>';
+				}
+				$update_actions['activate'] = '<a href="' . esc_url( $activate_link ) . '" class="activatelink"><span aria-hidden="true">' . __( 'Activate' ) . '</span><span class="screen-reader-text">' . sprintf( __( 'Activate &#8220;%s&#8221;' ), $name ) . '</span></a>';
+			}
+
+			if ( ! $this->result || is_wp_error( $this->result ) || is_network_admin() )
+				unset( $update_actions['preview'], $update_actions['activate'] );
+		}
+
+		$update_actions['themes_page'] = '<a href="' . self_admin_url( 'themes.php' ) . '" target="_parent">' . __( 'Return to Themes page' ) . '</a>';
+
+		/**
+		 * Filters the list of action links available following a single theme update.
+		 *
+		 * @since 2.8.0
+		 *
+		 * @param array  $update_actions Array of theme action links.
+		 * @param string $theme          Theme directory name.
+		 */
+		$update_actions = apply_filters( 'update_theme_complete_actions', $update_actions, $this->theme );
+
+		if ( ! empty($update_actions) )
+			$this->feedback(implode(' | ', (array)$update_actions));
+	}
+}