From 128fd6d6b7373e111889cb85de2c0a8e444eebff Mon Sep 17 00:00:00 2001
From: Gregory Moskaliuk <mosckalyuck@gmail.com>
Date: Tue, 20 Oct 2026 23:18:05 +0200
Subject: [PATCH] Pass the clip rect through iOS views that don't clip subviews

When a ScrollView updates clipped subviews, every view on the way down converts
the clip rect into its own coordinates and passes it on, although only views
with removeClippedSubviews use it, and those convert it from the view it is
relative to themselves. Views that don't clip now pass the rect on unchanged,
still relative to the same view, so a clipping view converts it once instead
of once per level.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 .../React/Fabric/Mounting/UIView+ComponentViewProtocol.mm  | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/packages/react-native/React/Fabric/Mounting/UIView+ComponentViewProtocol.mm b/packages/react-native/React/Fabric/Mounting/UIView+ComponentViewProtocol.mm
index 36e5f64f4b19..9bb6a6dce159 100644
--- a/packages/react-native/React/Fabric/Mounting/UIView+ComponentViewProtocol.mm
+++ b/packages/react-native/React/Fabric/Mounting/UIView+ComponentViewProtocol.mm
@@ -163,13 +163,12 @@ - (void)setPropKeysManagedByAnimated_DO_NOT_USE_THIS_IS_BROKEN:(nullable NSSet<N
 
 - (void)updateClippedSubviewsWithClipRect:(CGRect)clipRect relativeToView:(UIView *)clipView
 {
-  clipRect = [clipView convertRect:clipRect toView:self];
-
   // Normal views don't support unmounting, so all
   // this does is forward message to our subviews,
-  // in case any of those do support it
+  // in case any of those do support it. The rect stays relative to `clipView`;
+  // a view that clips converts it to its own coordinates.
   for (UIView *subview in self.subviews) {
-    [subview updateClippedSubviewsWithClipRect:clipRect relativeToView:self];
+    [subview updateClippedSubviewsWithClipRect:clipRect relativeToView:clipView];
   }
 }