diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-admin/includes/class-plugin-upgrader-skin.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-admin/includes/class-plugin-upgrader-skin.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,70 @@
+<?php
+/**
+ * Upgrader API: Plugin_Upgrader_Skin class
+ *
+ * @package WordPress
+ * @subpackage Upgrader
+ * @since 4.6.0
+ */
+
+/**
+ * Plugin Upgrader Skin for WordPress Plugin 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 Plugin_Upgrader_Skin extends WP_Upgrader_Skin {
+	public $plugin = '';
+	public $plugin_active = false;
+	public $plugin_network_active = false;
+
+	/**
+	 *
+	 * @param array $args
+	 */
+	public function __construct( $args = array() ) {
+		$defaults = array( 'url' => '', 'plugin' => '', 'nonce' => '', 'title' => __('Update Plugin') );
+		$args = wp_parse_args($args, $defaults);
+
+		$this->plugin = $args['plugin'];
+
+		$this->plugin_active = is_plugin_active( $this->plugin );
+		$this->plugin_network_active = is_plugin_active_for_network( $this->plugin );
+
+		parent::__construct($args);
+	}
+
+	/**
+	 */
+	public function after() {
+		$this->plugin = $this->upgrader->plugin_info();
+		if ( !empty($this->plugin) && !is_wp_error($this->result) && $this->plugin_active ){
+			// Currently used only when JS is off for a single plugin update?
+			echo '<iframe title="' . esc_attr__( 'Update progress' ) . '" style="border:0;overflow:hidden" width="100%" height="170" src="' . wp_nonce_url( 'update.php?action=activate-plugin&networkwide=' . $this->plugin_network_active . '&plugin=' . urlencode( $this->plugin ), 'activate-plugin_' . $this->plugin ) . '"></iframe>';
+		}
+
+		$this->decrement_update_count( 'plugin' );
+
+		$update_actions =  array(
+			'activate_plugin' => '<a href="' . wp_nonce_url( 'plugins.php?action=activate&amp;plugin=' . urlencode( $this->plugin ), 'activate-plugin_' . $this->plugin) . '" target="_parent">' . __( 'Activate Plugin' ) . '</a>',
+			'plugins_page' => '<a href="' . self_admin_url( 'plugins.php' ) . '" target="_parent">' . __( 'Return to Plugins page' ) . '</a>'
+		);
+		if ( $this->plugin_active || ! $this->result || is_wp_error( $this->result ) || ! current_user_can( 'activate_plugin', $this->plugin ) )
+			unset( $update_actions['activate_plugin'] );
+
+		/**
+		 * Filters the list of action links available following a single plugin update.
+		 *
+		 * @since 2.7.0
+		 *
+		 * @param array  $update_actions Array of plugin action links.
+		 * @param string $plugin         Path to the plugin file.
+		 */
+		$update_actions = apply_filters( 'update_plugin_complete_actions', $update_actions, $this->plugin );
+
+		if ( ! empty($update_actions) )
+			$this->feedback(implode(' | ', (array)$update_actions));
+	}
+}