Plugin_Upgrader::active_after

		}

		// Assume the requested plugin is the first in the list.
		$pluginfiles = array_keys( $plugin );

		return $this->result['destination_name'] . '/' . $pluginfiles[0];
	}

	/**
	 * Deactivates a plugin before it is upgraded.
	 *
	 * Hooked to the {@see 'upgrader_pre_install'} filter by Plugin_Upgrader::upgrade().
	 *
	 * @since 2.8.0
	 * @since 4.1.0 Added a return value.
	 *
	 * @param bool|WP_Error $return Upgrade offer return.
	 * @param array         $plugin Plugin package arguments.
	 * @return bool|WP_Error The passed in $return param or WP_Error.
	 */
	public function deactivate_plugin_before_upgrade( $return, $plugin ) {

		if ( is_wp_error( $return ) ) { // Bypass.
			return $return;