other changes

Author: Saadnajmi

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -1010,10 +1010,20 @@ - (RCTUIView *)currentContainerView // [macOS]
   if (_useCustomContainerView) {
     if (!_containerView) {
       _containerView = [[RCTPlatformView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; // [macOS]
+#if TARGET_OS_OSX // [macOS
+      _containerView.wantsLayer = YES;
+#endif // macOS]
       for (RCTPlatformView *subview in self.subviews) { // [macOS]
         [_containerView addSubview:subview];
       }
+#if !TARGET_OS_OSX // [macOS]
       _containerView.clipsToBounds = self.clipsToBounds;
+#else // [macOS
+      // On macOS, clipsToBounds doesn't automatically set layer.masksToBounds
+      // like it does on iOS, so we need to set it directly.
+      _containerView.clipsToBounds = _props->getClipsContentToBounds();
+      _containerView.layer.masksToBounds = _props->getClipsContentToBounds();
+#endif // macOS]
       self.clipsToBounds = NO;
       _containerView.layer.mask = self.layer.mask;
       self.layer.mask = nil;
@@ -1045,8 +1055,15 @@ - (void)invalidateLayer
   }
 
 #if TARGET_OS_OSX // [macOS
-  // clipsToBounds is stubbed out on macOS because it's not part of NSView
-  layer.masksToBounds = self.clipsToBounds;
+  // On macOS, clipsToBounds doesn't automatically set layer.masksToBounds like iOS does.
+  // When _useCustomContainerView is true (boxShadow + overflow:hidden), the container
+  // view handles clipping children while the main layer stays unclipped for the shadow.
+  // The container view's masksToBounds is set in currentContainerView getter.
+  if (_useCustomContainerView) {
+    layer.masksToBounds = NO;
+  } else {
+    layer.masksToBounds = _props->getClipsContentToBounds();
+  }
 #endif // macOS]
 
   const auto borderMetrics = _props->resolveBorderMetrics(_layoutMetrics);
@@ -1184,6 +1201,10 @@ - (void)invalidateLayer
       [layer addSublayer:borderLayer];
       _borderLayer = borderLayer;
     }
+#if TARGET_OS_OSX // [macOS
+    // Update frame on every call in case view was resized
+    _borderLayer.frame = layer.bounds;
+#endif // macOS]
 
     layer.borderWidth = 0;
     layer.borderColor = nil;
@@ -1284,7 +1305,8 @@ - (void)invalidateLayer
   if (!_props->boxShadow.empty()) {
     _boxShadowLayer = [CALayer layer];
     [self.layer addSublayer:_boxShadowLayer];
-    _boxShadowLayer.zPosition = _borderLayer.zPosition;
+    // Box shadow should be behind all content but still visible
+    _boxShadowLayer.zPosition = BACKGROUND_COLOR_ZPOSITION - 1;
     _boxShadowLayer.frame = RCTGetBoundingRect(_props->boxShadow, self.layer.bounds.size);
 
     RCTUIImage *boxShadowImage = RCTGetBoxShadowImage( // [macOS]