diff -r c7c34916027a -r 177826044cd9 wp/wp-admin/includes/class-plugin-upgrader-skin.php
--- a/wp/wp-admin/includes/class-plugin-upgrader-skin.php	Mon Oct 14 18:06:33 2019 +0200
+++ b/wp/wp-admin/includes/class-plugin-upgrader-skin.php	Mon Oct 14 18:28:13 2019 +0200
@@ -16,55 +16,61 @@
  * @see WP_Upgrader_Skin
  */
 class Plugin_Upgrader_Skin extends WP_Upgrader_Skin {
-	public $plugin = '';
-	public $plugin_active = false;
+	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);
+		$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_active         = is_plugin_active( $this->plugin );
 		$this->plugin_network_active = is_plugin_active_for_network( $this->plugin );
 
-		parent::__construct($args);
+		parent::__construct( $args );
 	}
 
 	/**
 	 */
 	public function after() {
 		$this->plugin = $this->upgrader->plugin_info();
-		if ( !empty($this->plugin) && !is_wp_error($this->result) && $this->plugin_active ){
+		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>'
+		$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 ) )
+		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.
+		 * @param string[] $update_actions Array of plugin action links.
+		 * @param string   $plugin         Path to the plugin file relative to the plugins directory.
 		 */
 		$update_actions = apply_filters( 'update_plugin_complete_actions', $update_actions, $this->plugin );
 
-		if ( ! empty($update_actions) )
-			$this->feedback(implode(' | ', (array)$update_actions));
+		if ( ! empty( $update_actions ) ) {
+			$this->feedback( implode( ' | ', (array) $update_actions ) );
+		}
 	}
 }