fix(Viewer): add fallback title setter to handle case where filename is absent in path

Signed-off-by: Andrew Backhouse <andrew.backhouse@nextcloud.com>

Author: emberfiend

css/main-Ke6Ju54g.chunk.css css/main-Bg3U4zXh.chunk.csscss/main-Ke6Ju54g.chunk.css renamed to css/main-Bg3U4zXh.chunk.css

@@ -1,3 +1,3 @@
 /* extracted by css-entry-points-plugin */
-@import './main-Ke6Ju54g.chunk.css';
+@import './main-Bg3U4zXh.chunk.css';
 @import './previewUtils-DsspQ6dL.chunk.css';

css/viewer-main.css

@@ -742,6 +742,15 @@ export default defineComponent({
 			this.handlerId = handler.id
 
 			this.currentFile = new File(fileInfo, mime, handler.component)
+
+			// if openFile() couldn’t derive a name from the path (e.g. "/" for single-file shares),
+			// fall back to the displayname to set the title
+			const title = document.getElementsByTagName('head')[0].getElementsByTagName('title')[0]
+			if (title && !title.dataset.old && this.currentFile.displayname) {
+				title.dataset.old = document.title
+				this.updateTitle(this.currentFile.displayname)
+			}
+
 			this.comparisonFile = null
 			this.updatePreviousNext()