From d9b45d390be3c26b2d0938283fa3182556553b98 Mon Sep 17 00:00:00 2001
From: Tobias <tobfa@cendio.se>
Date: Sat, 13 Sep 2025 00:00:13 +0200
Subject: [PATCH] Disable clipboard button with async clipboard

With async clipboard available, the fallback clipboard textarea adds
mostly confusion. If async clipboard is out right denied, users most
likely don't want to see any clipboard activity.
---
 app/ui.js | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/app/ui.js b/app/ui.js
index 2542e059..2b936c02 100644
--- a/app/ui.js
+++ b/app/ui.js
@@ -9,7 +9,7 @@
 import * as Log from '../core/util/logging.js';
 import _, { l10n } from './localization.js';
 import { isTouchDevice, isMac, isIOS, isAndroid, isChromeOS, isSafari,
-         hasScrollbarGutter, dragThreshold }
+         hasScrollbarGutter, dragThreshold, browserAsyncClipboardSupport }
     from '../core/util/browser.js';
 import { setCapture, getPointerEvent } from '../core/util/events.js';
 import KeyTable from "../core/input/keysym.js";
@@ -1103,6 +1103,7 @@ const UI = {
         UI.rfb.showDotCursor = UI.getSetting('show_dot');
 
         UI.updateViewOnly(); // requires UI.rfb
+        UI.updateClipboard();
     },
 
     disconnect() {
@@ -1754,6 +1755,31 @@ const UI = {
         }
     },
 
+    updateClipboard() {
+        browserAsyncClipboardSupport()
+            .then((support) => {
+                if (support === 'unsupported') {
+                    // Use fallback clipboard panel
+                    return;
+                }
+                if (support === 'denied' || support === 'available') {
+                    UI.closeClipboardPanel();
+                    document.getElementById('noVNC_clipboard_button')
+                        .classList.add('noVNC_hidden');
+                    document.getElementById('noVNC_clipboard_button')
+                        .removeEventListener('click', UI.toggleClipboardPanel);
+                    document.getElementById('noVNC_clipboard_text')
+                        .removeEventListener('change', UI.clipboardSend);
+                    if (UI.rfb) {
+                        UI.rfb.removeEventListener('clipboard', UI.clipboardReceive);
+                    }
+                }
+            })
+            .catch(() => {
+                // Treat as unsupported
+            });
+    },
+
     updateShowDotCursor() {
         if (!UI.rfb) return;
         UI.rfb.showDotCursor = UI.getSetting('show_dot');