first commit

wp-content/plugins/sitepress-multilingual-cms/classes/language/Detection/Rest.php

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+<?php
+
+namespace WPML\Language\Detection;
+
+use \WPML_Request;
+
+class Rest extends WPML_Request {
+	/** @var Backend */
+	private $backend;
+
+	public function __construct(
+		$url_converter,
+		$active_languages,
+		$default_language,
+		$cookieLanguage,
+		$backend
+	) {
+		parent::__construct( $url_converter, $active_languages, $default_language, $cookieLanguage );
+		$this->backend = $backend;
+	}
+
+
+	protected function get_cookie_name() {
+		return $this->cookieLanguage->getAjaxCookieName( ! $this->getFrontendLanguage() );
+	}
+
+	public function get_requested_lang() {
+		return $this->getFrontendLanguage() ?: $this->backend->get_requested_lang();
+	}
+
+	/**
+	 * It tries to detect language in FRONTEND manner.
+	 *
+	 * We ignore a default language due to fallback mechanism in WPML_URL_Converter_Subdir_Strategy which never returns
+	 * NULL when `use_directory_for_default_lang` option is enabled.
+	 *
+	 * @return string|null
+	 */
+	private function getFrontendLanguage() {
+		$language = $this->get_request_uri_lang();
+
+		return $language && $language !== $this->default_language ? $language : null;
+	}
+}