[Android] textDecorationLine underline disappears from an unchanged Text after a sibling is inserted (0.87.1) #58999

Description

On Android, an underline set with textDecorationLine: 'underline' disappears from a <Text> whose own props and position did not change, once its parent commits a layout change around it (here: sibling rows inserted after it). The text still renders; only the decoration is gone. Newly mounted Text views, and Text views that moved, keep the underline. iOS is not affected.

It happens for both nested (<Text>a <Text style={{textDecorationLine: 'underline'}}>b</Text></Text>) and standalone underlined Text.

In 0.87 Android underline drawing moved from the framework UnderlineSpan to ReactUnderlineSpan (a CanvasEffectSpan painted from ReactTextView.onDraw → drawTextEffects → drawSpannedDecoration), as part of the textDecorationStyle work (87184c8). The symptom looks like that path draws nothing when an existing ReactTextView is only redrawn.

Possibly related, but different symptoms: #57900 (decoration position), #58356 (crash with numberOfLines).

We first saw it in an app where, among many identically styled rows, only some kept their underline — the ones that happened to be re-laid-out in the same commit.

Steps to reproduce

1. Clone https://github.com/ChoiHyeongu/rn-087-android-underline-repro, then cd ReproducerApp && yarn install && yarn android.
2. On launch, every row is underlined.
3. Tap INSERT. Eight k rows are inserted between the n rows and the s rows.
4. Every n row (unchanged, above the insertion) loses its underline. The inserted k rows and the shifted s rows keep it.

RERENDER (parent state change only) and REMOUNT (key change) do not trigger it.

React Native Version

0.87.1

Affected Platforms

Runtime - Android

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

System:
  OS: macOS 26.5
  CPU: (14) arm64 Apple M4 Pro
  Memory: 3.49 GB / 48.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 24.14.0
    path: ~/.local/share/mise/installs/node/24.14.0/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.local/share/mise/installs/node/24.14.0/bin/yarn
  npm:
    version: 11.9.0
    path: ~/.local/share/mise/installs/node/24.14.0/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.5
      - iOS 26.5
      - macOS 26.5
      - tvOS 26.5
      - visionOS 26.5
      - watchOS 26.5
  Android SDK: Not Found
IDEs:
  Android Studio: 2025.3 AI-253.32098.37.2534.15336583
  Xcode:
    version: 26.6/17F113
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 23.0.2
    path: /usr/bin/javac
  Ruby:
    version: 3.4.2
    path: ~/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.2.0
    wanted: 20.2.0
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.87.1
    wanted: 0.87.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false

Stacktrace or Logs

No crash and no warnings — visual-only. The underline is simply not drawn.

MANDATORY Reproducer

https://github.com/ChoiHyeongu/rn-087-android-underline-repro

Screenshots and Videos

Pixel 9 Pro emulator, Android 16 (API 36).

Before	After tapping INSERT