[macOS] Fix touch events never being delivered

packages/react-native-gesture-handler/apple/RNGestureHandlerPointerTracker.mm

@@ -39,7 +39,14 @@
 - (int)unregisterTouch:(RNGHUITouch *)touch
 {
   for (int index = 0; index < MAX_POINTERS_COUNT; index++) {
+#if TARGET_OS_OSX
+    // A macOS mouse sequence delivers a fresh NSEvent per event, so identity matching
+    // (valid on iOS, where a UITouch is one stable object for the whole touch) never
+    // matches. There is only one mouse pointer — match the tracked slot instead.
+    if (_trackedPointers[index] != nil) {
+#else
     if (_trackedPointers[index] == touch) {
+#endif
       _trackedPointers[index] = nil;
       return index;
     }
@@ -51,7 +58,12 @@
 - (int)findTouchIndex:(RNGHUITouch *)touch
 {
   for (int index = 0; index < MAX_POINTERS_COUNT; index++) {
+#if TARGET_OS_OSX
+    // See unregisterTouch: — identity matching cannot work for NSEvents.
+    if (_trackedPointers[index] != nil) {
+#else
     if (_trackedPointers[index] == touch) {
+#endif
       return index;
     }
   }
@@ -94,7 +106,7 @@
 {
   int registeredTouches = [self registeredTouchesCount];
 
   NSDictionary *data[registeredTouches];
   int nextIndex = 0;
 
   for (int i = 0; i < MAX_POINTERS_COUNT; i++) {
@@ -115,7 +127,7 @@
 
   _eventType = RNGHTouchEventTypePointerDown;
 
   NSDictionary *data[touches.count];
   int changedCount = 0;
 
   for (int i = 0; i < [touches count]; i++) {
@@ -148,7 +160,7 @@
 
   _eventType = RNGHTouchEventTypePointerMove;
 
   NSDictionary *data[touches.count];
   int changedCount = 0;
 
   for (int i = 0; i < [touches count]; i++) {
@@ -159,6 +171,12 @@
       continue;
     }
 
+#if TARGET_OS_OSX
+    // Replace the stored mouse-down event with the latest one so extractAllTouches
+    // reads the pointer's current position, not where the sequence started.
+    _trackedPointers[index] = touch;
+#endif
+
     data[changedCount++] = [self extractPointerData:index forTouch:touch];
   }
 
@@ -177,12 +195,24 @@
     return;
   }
 
+#if TARGET_OS_OSX
+  // Refresh the tracked slot with the ending event so extractAllTouches below reports
+  // the pointer's final position. On iOS the stored UITouch is a live object that
+  // always reads its current location; a stored NSEvent is a stale snapshot.
+  for (RNGHUITouch *touch in touches) {
+    int index = [self findTouchIndex:touch];
+    if (index >= 0) {
+      _trackedPointers[index] = touch;
+    }
+  }
+#endif
+
   // extract all touches first to include the ones that were just lifted
   [self extractAllTouches];
 
   _eventType = RNGHTouchEventTypePointerUp;
 
   NSDictionary *data[touches.count];
   int changedCount = 0;
 
   for (int i = 0; i < [touches count]; i++) {
@@ -242,7 +272,7 @@
 
   if (registeredTouches > 0) {
     int nextIndex = 0;
     NSDictionary *data[registeredTouches];
 
     for (int i = 0; i < MAX_POINTERS_COUNT; i++) {
       RNGHUITouch *touch = _trackedPointers[i];