From 1488060c3832557f125ed21c2d688bb085d3c456 Mon Sep 17 00:00:00 2001
From: Frank3K <8014077+Frank3K@users.noreply.github.com>
Date: Tue, 7 Jul 2026 22:54:11 +0200
Subject: [PATCH] fix: enable Quick Look AR in third-party iOS browsers without
 ios-src

The AR button stopped appearing in Chrome (and Edge/Firefox/DuckDuckGo)
on iOS unless an explicit `ios-src` was provided. Those browsers can
launch Quick Look with model-viewer's auto-generated USDZ, so the
`ios-src` requirement is unnecessary and regressed behavior that worked
in 4.2.0.

Drop the `(!IS_IOS_THIRDPARTY || this.iosSrc != null)` clause from the
quick-look mode selection. Quick Look remains disabled in the Google
Search App webview (`!IS_IOS_GSA`), where it is genuinely broken.

Fixes #5185
---
 packages/model-viewer/src/features/ar.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/model-viewer/src/features/ar.ts b/packages/model-viewer/src/features/ar.ts
index 54f28d1c58..ef0f4d7cf4 100644
--- a/packages/model-viewer/src/features/ar.ts
+++ b/packages/model-viewer/src/features/ar.ts
@@ -17,7 +17,7 @@ import {property} from 'lit/decorators.js';
 import {Object3D} from 'three';
 import {USDZExporter} from 'three/examples/jsm/exporters/USDZExporter.js';
 
-import {IS_AR_QUICKLOOK_CANDIDATE, IS_IOS_GSA, IS_IOS_THIRDPARTY, IS_SCENEVIEWER_CANDIDATE, IS_WEBXR_AR_CANDIDATE} from '../constants.js';
+import {IS_AR_QUICKLOOK_CANDIDATE, IS_IOS_GSA, IS_SCENEVIEWER_CANDIDATE, IS_WEBXR_AR_CANDIDATE} from '../constants.js';
 import ModelViewerElementBase, {$needsRender, $progressTracker, $renderer, $scene, $shouldAttemptPreload, $updateSource} from '../model-viewer-base.js';
 import {enumerationDeserializer} from '../styles/deserializers.js';
 import {ARStatus, ARTracking} from '../three-components/ARRenderer.js';
@@ -244,7 +244,7 @@ configuration or device capabilities');
               break;
             }
             if (value === 'quick-look' && IS_AR_QUICKLOOK_CANDIDATE &&
-                !IS_IOS_GSA && (!IS_IOS_THIRDPARTY || this.iosSrc != null)) {
+                !IS_IOS_GSA) {
               arMode = ARMode.QUICK_LOOK;
               break;
             }