From 3b924ecb04de8f382302a6fb031af70a36f6b1dd Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 2 Feb 2023 21:29:32 +0530
Subject: [PATCH] Dont try to cancel non cancelable event

---
 src/pyj/read_book/touch.pyj | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pyj/read_book/touch.pyj b/src/pyj/read_book/touch.pyj
index b26c11f642..4265d0a846 100644
--- a/src/pyj/read_book/touch.pyj
+++ b/src/pyj/read_book/touch.pyj
@@ -213,7 +213,8 @@ class TouchHandler:
             self.reset_handlers()
 
     def handle_touchcancel(self, ev):
-        ev.preventDefault(), ev.stopPropagation()
+        if ev.cancelable:
+            ev.preventDefault(), ev.stopPropagation()
         for touch in ev.changedTouches:
             tid = touch_id(touch)  # noqa: unused-local
             v'delete self.ongoing_touches[tid]'