diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-admin/includes/class-plugin-installer-skin.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-admin/includes/class-plugin-installer-skin.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,98 @@
+<?php
+/**
+ * Upgrader API: Plugin_Installer_Skin class
+ *
+ * @package WordPress
+ * @subpackage Upgrader
+ * @since 4.6.0
+ */
+
+/**
+ * Plugin Installer Skin for WordPress Plugin Installer.
+ *
+ * @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_Installer_Skin extends WP_Upgrader_Skin {
+	public $api;
+	public $type;
+
+	/**
+	 *
+	 * @param array $args
+	 */
+	public function __construct($args = array()) {
+		$defaults = array( 'type' => 'web', 'url' => '', 'plugin' => '', 'nonce' => '', 'title' => '' );
+		$args = wp_parse_args($args, $defaults);
+
+		$this->type = $args['type'];
+		$this->api = isset($args['api']) ? $args['api'] : array();
+
+		parent::__construct($args);
+	}
+
+	/**
+	 */
+	public function before() {
+		if ( !empty($this->api) )
+			$this->upgrader->strings['process_success'] = sprintf( __('Successfully installed the plugin <strong>%s %s</strong>.'), $this->api->name, $this->api->version);
+	}
+
+	/**
+	 */
+	public function after() {
+		$plugin_file = $this->upgrader->plugin_info();
+
+		$install_actions = array();
+
+		$from = isset($_GET['from']) ? wp_unslash( $_GET['from'] ) : 'plugins';
+
+		if ( 'import' == $from ) {
+			$install_actions['activate_plugin'] = '<a class="button button-primary" href="' . wp_nonce_url( 'plugins.php?action=activate&amp;from=import&amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ) . '" target="_parent">' . __( 'Activate Plugin &amp; Run Importer' ) . '</a>';
+		} else if ( 'press-this' == $from ) {
+			$install_actions['activate_plugin'] = '<a class="button button-primary" href="' . wp_nonce_url( 'plugins.php?action=activate&amp;from=press-this&amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ) . '" target="_parent">' . __( 'Activate Plugin &amp; Return to Press This' ) . '</a>';
+		} else {
+			$install_actions['activate_plugin'] = '<a class="button button-primary" href="' . wp_nonce_url( 'plugins.php?action=activate&amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ) . '" target="_parent">' . __( 'Activate Plugin' ) . '</a>';
+		}
+
+		if ( is_multisite() && current_user_can( 'manage_network_plugins' ) ) {
+			$install_actions['network_activate'] = '<a class="button button-primary" href="' . wp_nonce_url( 'plugins.php?action=activate&amp;networkwide=1&amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ) . '" target="_parent">' . __( 'Network Activate' ) . '</a>';
+			unset( $install_actions['activate_plugin'] );
+		}
+
+		if ( 'import' == $from ) {
+			$install_actions['importers_page'] = '<a href="' . admin_url( 'import.php' ) . '" target="_parent">' . __( 'Return to Importers' ) . '</a>';
+		} elseif ( $this->type == 'web' ) {
+			$install_actions['plugins_page'] = '<a href="' . self_admin_url( 'plugin-install.php' ) . '" target="_parent">' . __( 'Return to Plugin Installer' ) . '</a>';
+		} elseif ( 'upload' == $this->type && 'plugins' == $from ) {
+			$install_actions['plugins_page'] = '<a href="' . self_admin_url( 'plugin-install.php' ) . '">' . __( 'Return to Plugin Installer' ) . '</a>';
+		} else {
+			$install_actions['plugins_page'] = '<a href="' . self_admin_url( 'plugins.php' ) . '" target="_parent">' . __( 'Return to Plugins page' ) . '</a>';
+		}
+
+		if ( ! $this->result || is_wp_error($this->result) ) {
+			unset( $install_actions['activate_plugin'], $install_actions['network_activate'] );
+		} elseif ( ! current_user_can( 'activate_plugin', $plugin_file ) ) {
+			unset( $install_actions['activate_plugin'] );
+		}
+
+		/**
+		 * Filters the list of action links available following a single plugin installation.
+		 *
+		 * @since 2.7.0
+		 *
+		 * @param array  $install_actions Array of plugin action links.
+		 * @param object $api             Object containing WordPress.org API plugin data. Empty
+		 *                                for non-API installs, such as when a plugin is installed
+		 *                                via upload.
+		 * @param string $plugin_file     Path to the plugin file.
+		 */
+		$install_actions = apply_filters( 'install_plugin_complete_actions', $install_actions, $this->api, $plugin_file );
+
+		if ( ! empty( $install_actions ) ) {
+			$this->feedback( implode( ' ', (array) $install_actions ) );
+		}
+	}
+}