From a3918f4102bc7adcf0e512d92d9294cdece17686 Mon Sep 17 00:00:00 2001
From: Samuel Susla <samuelsusla@fb.com>
Date: Mon, 21 Dec 2020 13:59:02 -0800
Subject: [PATCH] Cancel touches if surface touch handler can be prevented

Summary:
Changelog: [internal]

If `otherGestureRecognizer` prevents Fabric's gesture recogniser, we need to manually reset the inner state.
This cancels any currently active touches.

Reviewed By: shergin

Differential Revision: D25664384

fbshipit-source-id: 9e3cd41351381bcfed2836dad3e80d5f021f936c
---
 React/Fabric/RCTSurfaceTouchHandler.mm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/React/Fabric/RCTSurfaceTouchHandler.mm b/React/Fabric/RCTSurfaceTouchHandler.mm
index e556a3af6d1..6c06fa764b7 100644
--- a/React/Fabric/RCTSurfaceTouchHandler.mm
+++ b/React/Fabric/RCTSurfaceTouchHandler.mm
@@ -410,4 +410,14 @@ RCT_NOT_IMPLEMENTED(-(instancetype)initWithTarget : (id)target action : (SEL)act
   return [self canBePreventedByGestureRecognizer:otherGestureRecognizer];
 }
 
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
+    shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
+{
+  BOOL canBePrevented = [self canBePreventedByGestureRecognizer:otherGestureRecognizer];
+  if (canBePrevented) {
+    [self reset];
+  }
+  return NO;
+}
+
 @end