From 29c3b7bec5211aa4551880c60b55620372bfe0cc Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 15 Dec 2024 18:11:11 +0100
Subject: [PATCH] Disable touch-zooming, in the viewer, if `AbortSignal.any` is
 unsupported (PR 19216 follow-up)

This way loading of the *entire* viewer won't break in older browsers that lack `AbortSignal.any` support; see https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/any_static#browser_compatibility
---
 web/app.js | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/web/app.js b/web/app.js
index 8aa1efe3602ea..109318be687f5 100644
--- a/web/app.js
+++ b/web/app.js
@@ -2045,14 +2045,19 @@ const PDFViewerApplication = {
       _windowAbortController: { signal },
     } = this;
 
-    this._touchManager = new TouchManager({
-      container: window,
-      isPinchingDisabled: () => this.pdfViewer.isInPresentationMode,
-      isPinchingStopped: () => this.overlayManager?.active,
-      onPinching: this.touchPinchCallback.bind(this),
-      onPinchEnd: this.touchPinchEndCallback.bind(this),
-      signal,
-    });
+    if (
+      (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
+      typeof AbortSignal.any === "function"
+    ) {
+      this._touchManager = new TouchManager({
+        container: window,
+        isPinchingDisabled: () => pdfViewer.isInPresentationMode,
+        isPinchingStopped: () => this.overlayManager?.active,
+        onPinching: this.touchPinchCallback.bind(this),
+        onPinchEnd: this.touchPinchEndCallback.bind(this),
+        signal,
+      });
+    }
 
     function addWindowResolutionChange(evt = null) {
       if (evt) {