fix: ensure enabled (enforced) themes are always set on template layout

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

apps/theming/lib/Service/ThemesService.php

@@ -148,8 +148,7 @@ class ThemesService {
 	}
 
 	/**
-	 * Get the list of all enabled themes IDs
-	 * for the logged-in user
+	 * Get the list of all enabled themes IDs for the current user.
 	 *
 	 * @return string[]
 	 */

cypress/e2e/core/404-error.cy.ts

@@ -0,0 +1,19 @@
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+describe('404 error page', { testIsolation: true }, () => {
+	it('renders 404 page', () => {
+		cy.visit('/doesnotexist', { failOnStatusCode: false })
+
+		cy.findByRole('heading', { name: /Page not found/ })
+			.should('be.visible')
+		cy.findByRole('link', { name: /Back to Nextcloud/ })
+			.should('be.visible')
+			.click()
+
+		cy.url()
+			.should('match', /(\/index.php)\/login$/)
+	})
+})

lib/private/TemplateLayout.php

@@ -80,12 +80,6 @@ class TemplateLayout {
 				} else {
 					Util::addScript('core', 'unified-search', 'core');
 				}
-				// Set body data-theme
-				$page->assign('enabledThemes', []);
-				if ($this->appManager->isEnabledForUser('theming') && class_exists('\OCA\Theming\Service\ThemesService')) {
-					$themesService = Server::get(\OCA\Theming\Service\ThemesService::class);
-					$page->assign('enabledThemes', $themesService->getEnabledThemes());
-				}
 
 				// Set logo link target
 				$logoUrl = $this->config->getSystemValueString('logo_url', '');
@@ -157,13 +151,6 @@ class TemplateLayout {
 				$page->assign('appid', $appId);
 				$page->assign('bodyid', 'body-public');
 
-				// Set body data-theme
-				$page->assign('enabledThemes', []);
-				if ($this->appManager->isEnabledForUser('theming') && class_exists('\OCA\Theming\Service\ThemesService')) {
-					$themesService = Server::get(\OCA\Theming\Service\ThemesService::class);
-					$page->assign('enabledThemes', $themesService->getEnabledThemes());
-				}
-
 				// Set logo link target
 				$logoUrl = $this->config->getSystemValueString('logo_url', '');
 				$page->assign('logoUrl', $logoUrl);
@@ -203,6 +190,10 @@ class TemplateLayout {
 		$page->assign('locale', $locale);
 		$page->assign('direction', $direction);
 
+		// Set body data-theme
+		$themesService = Server::get(\OCA\Theming\Service\ThemesService::class);
+		$page->assign('enabledThemes', $themesService->getEnabledThemes());
+
 		if ($this->config->getSystemValueBool('installed', false)) {
 			if (empty(self::$versionHash)) {
 				$v = $this->appManager->getAppInstalledVersions();