From 1246a455f3e68b199988b2df61cfedb8bfc25404 Mon Sep 17 00:00:00 2001
From: the-djmaze <3752035+the-djmaze@users.noreply.github.com>
Date: Mon, 2 Nov 2026 18:16:40 +0100
Subject: [PATCH] Ask the browser properly whether it can preview a PDF
 https://github.com/kimusan/Tachyon/commit/8086beb6c212b905a0ddce1409f5a7ead0e6c595

---
 dev/Model/Attachment.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/dev/Model/Attachment.js b/dev/Model/Attachment.js
index 93fbc42f4..4a83dcafd 100644
--- a/dev/Model/Attachment.js
+++ b/dev/Model/Attachment.js
@@ -104,7 +104,18 @@ export class AttachmentModel extends AbstractModel {
 	 * @returns {boolean}
 	 */
 	pdfPreview() {
-		return null != navigator.mimeTypes['application/pdf'] && FileType.Pdf === this.fileType;
+		/**
+		 * navigator.pdfViewerEnabled is the supported way to ask this.
+		 * navigator.mimeTypes is deprecated and browsers now expose a PDF entry
+		 * there only while the built in viewer is on, so the old check quietly
+		 * returned false in cases where a preview would have worked and took
+		 * the eye badge with it.
+		 */
+		return FileType.Pdf === this.fileType
+			&& (undefined !== navigator.pdfViewerEnabled
+				? navigator.pdfViewerEnabled
+				: null != navigator.mimeTypes['application/pdf']
+			);
 	}
 
 	/**