enable opening a single shared file

Signed-off-by: Vanessa Pertsch <vanessa.pertsch@posteo.de>

src/utils/fileUtils.js

@@ -56,6 +56,18 @@ const extractFilePaths = function(path) {
 	return [dirPath, fileName]
 }
 
+/**
+ * A single shared file can be opend with path: '/'.
+ * In this case there is no parent folder to find sibling files in.
+ *
+ * @param {string} path the full path
+ * @return {boolean}
+ */
+const isSingleSharedFile = function(path) {
+
+	return path === '/'
+}
+
 /**
  * Sorting comparison function
  *
@@ -141,4 +153,4 @@ const getDavPath = function({ filename, basename }) {
 	return getRootPath() + encodeFilePath(filename)
 }
 
-export { encodeFilePath, extractFilePaths, sortCompare, genFileInfo, getDavPath }
+export { encodeFilePath, extractFilePaths, isSingleSharedFile, sortCompare, genFileInfo, getDavPath }

src/views/Viewer.vue

@@ -126,7 +126,7 @@ import ActionLink from '@nextcloud/vue/dist/Components/ActionLink.js'
 import isFullscreen from '@nextcloud/vue/dist/Mixins/isFullscreen.js'
 import Modal from '@nextcloud/vue/dist/Components/Modal.js'
 
-import { extractFilePaths, sortCompare } from '../utils/fileUtils.js'
+import { extractFilePaths, isSingleSharedFile, sortCompare } from '../utils/fileUtils.js'
 import { getRootPath } from '../utils/davUtils.js'
 import canDownload from '../utils/canDownload.js'
 import cancelableRequest from '../utils/CancelableRequest.js'
@@ -402,7 +402,7 @@ export default {
 
 					// store current position
 					this.currentIndex = this.fileList.findIndex(file => file.basename === fileName)
-				} else if (group) {
+				} else if (group && !isSingleSharedFile(path)) {
 					const mimes = this.mimeGroups[group]
 						? this.mimeGroups[group]
 						: [mime]