fix(iOS): Disable second transition coming from gestures when one is in progress

apps/src/tests/Test3093.tsx

@@ -4,7 +4,7 @@ import {
   NativeStackNavigationProp,
   createNativeStackNavigator,
 } from '@react-navigation/native-stack';
-import { Button, Text, View, ScrollView } from 'react-native';
+import { Button, Text, ScrollView } from 'react-native';
 import Colors from '../shared/styling/Colors';
 
 type StackRouteParamList = {
@@ -37,6 +37,7 @@ export default function App() {
   return (
     <NavigationContainer>
       <Stack.Navigator screenOptions={{
+        fullScreenGestureEnabled: true,
         headerStyle: {
           backgroundColor: Colors.PurpleDark120
         }

ios/RNSScreenStack.mm

@@ -1227,6 +1227,14 @@ - (BOOL)isScrollViewPanGestureRecognizer:(UIGestureRecognizer *)gestureRecognize
 // Be careful when adding another type of gesture recognizer.
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceivePressOrTouchEvent:(NSObject *)event
 {
+  if (@available(iOS 26, *)) {
+    // in iOS 26, you can swipe to pop screen before the previous one finished transitioning;
+    // this prevents from registering the second gesture
+    if ([self isTransitionInProgress]) {
+      return NO;
+    }
+  }
+
   RNSScreenView *topScreen = _reactSubviews.lastObject;
 
   for (RNSScreenView *s in _reactSubviews.reverseObjectEnumerator) {
@@ -1262,6 +1270,15 @@ - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceive
   return [self gestureRecognizer:gestureRecognizer shouldReceivePressOrTouchEvent:touch];
 }
 
+- (BOOL)isTransitionInProgress
+{
+  if (_controller.transitionCoordinator != nil) {
+    return YES;
+  }
+
+  return NO;
+}
+
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
     shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 {