fix(files): Only register preview service worker once when the instance is hosted at the root path

Signed-off-by: provokateurin <kate@provokateurin.de>
Signed-off-by: nextcloud-command <nextcloud-command@users.noreply.github.com>

apps/files/src/services/ServiceWorker.js

@@ -11,7 +11,14 @@ export default () => {
 		window.addEventListener('load', async () => {
 			try {
 				const url = generateUrl('/apps/files/preview-service-worker.js', {}, { noRewrite: true })
-				const scope = getRootUrl()
+				let scope = getRootUrl()
+				// If the instance is not in a subfolder an empty string will be returned.
+				// The service worker registration will use the current path if it receives an empty string,
+				// which will result in a service worker registration for every single path the user visits.
+				if (scope === '') {
+					scope = '/'
+				}
+
 				const registration = await navigator.serviceWorker.register(url, { scope })
 				logger.debug('SW registered: ', { registration })
 			} catch (error) {