iOS: ellipsizeMode="clip" renders RTL (Arabic) text as a mangled fragment at the line start

Bắt đầu với reproducer bắt buộc tại github.com/muhasabahhub/rn-arabic-seat và so sánh cách kết xuất trên iOS cho ellipsizeMode="clip" và "tail" bằng các hàng tiếng Ả Rập bị tràn. Truy vết đường dẫn kết xuất văn bản của React Native iOS từ reproducer. Hoàn tất khi văn bản RTL một dòng bị tràn được cắt gọn tại mép container mà không tạo ra một mảnh bị biến dạng, trong khi hành vi LTR vẫn đúng.

Description

With numberOfLines={1} and ellipsizeMode="clip", a one-line RTL (Arabic) string that overflows its container renders as a jumbled fragment collapsed at the visual start (right edge) on iOS, instead of drawing the line normally and clipping the overflow at the container edge. ellipsizeMode="tail" on the same string truncates without mangling (subject to #58315). LTR text clips correctly.

Observed with multiple Arabic fonts (Scheherazade New, KFGQPC Hafs) in the same reproducer as #58315: select the "clip" mode — every overflowing row shows the mangled fragment; screenshots in the repo README.

Steps to reproduce

1. Clone https://github.com/muhasabahhub/rn-arabic-seat, npm install, npx expo start, Expo Go on a physical iPhone.
2. Select: clip + any Arabic font (Scheherazade or Hafs). Mutations all off.
3. Overflowing rows (the second of each pair) render as a jumbled cluster at the right edge instead of a clean clipped line.
4. Switch to tail: same strings truncate without mangling.

React Native Version

0.86.3

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info

Expo SDK 57 managed project — envinfo equivalent below; full dependency table in the repo README.

 System:
    OS: Windows 11 10.0.26200
    CPU: (22) x64 Intel(R) Core(TM) Ultra 7 155H
    Memory: 3.80 GB / 15.59 GB
  Binaries:
    Node: 24.13.1 - C:\Program Files\nodejs\node.EXE
    npm: 11.19.0 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    expo: ~57.0.18 => 57.0.19
    expo-font: ~57.0.2 => 57.0.3
    react: 19.2.3 => 19.2.3
    react-native: 0.86.3 => 0.86.3
    react-native-safe-area-context: ~5.7.0 => 5.7.0


Device: iPhone 15, iOS 23.3.1, physical device via Expo Go. New Architecture (Fabric), Hermes.

Stacktrace or Logs

No crash or error output — this is a silent rendering defect. Nothing is logged.

MANDATORY Reproducer

https://github.com/muhasabahhub/rn-arabic-seat

Screenshots and Videos