TextInput claims the responder on every selection change, even with no active touch

Description

Where: Libraries/Components/TextInput/TextInput.js, onSelectionChangeShouldSetResponder={emptyFunctionThatReturnsTrue} (line 607 on main today), with {...otherProps} spread before it so a caller cannot override.

What happens: the claim exists for drag-selection with a finger down, but it fires for every selection change the plugin walks, including ones caused by typing, whenever the plugin's touch counter is above zero (see https://github.com/react/react/issues/37571 for how that counter drifts). The focused input then holds the JS responder with no touch active, and the next tap outside it is dropped.

Fix: claim only while event.touchHistory.numberActiveTouches > 0, and let a caller pass their own onSelectionChangeShouldSetResponder. Verified in an app patch on RN 0.85.3.

Proposed change (against main, packages/react-native/Libraries/Components/TextInput/TextInput.js, line 607 in InternalTextInput). Claim only while there is an active touch, and let a caller override:

         onSelectionChange={_onSelectionChange}
-        onSelectionChangeShouldSetResponder={emptyFunctionThatReturnsTrue}
+        // The claim exists for drag-selection with a finger down. Typing
+        // also changes the selection, and with no touch active the input
+        // must not take the responder, or the next tap outside it is dropped.
+        onSelectionChangeShouldSetResponder={
+          props.onSelectionChangeShouldSetResponder ??
+          (e => (e?.touchHistory?.numberActiveTouches ?? 0) > 0)
+        }
         selection={selection}

The same line appears once more in the Android branch of the same file. We run this in production through patch-package against React Native 0.85.3.

Steps to reproduce

As described above

React Native Version

0.85.3

Affected Platforms

Runtime - iOS

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

System:
  OS: macOS 26.5.1
  CPU: (12) arm64 Apple M2 Max
  Memory: 264.73 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 24.11.0
    path: /Users/michaelsageryd/.nvm/versions/node/v24.11.0/bin/node
  Yarn: Not Found
  npm:
    version: 11.3.0
    path: /Users/michaelsageryd/dev/plantrail/client/plantrail_mobile/node_modules/.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:
    API Levels:
      - "31"
      - "35"
      - "36"
      - "36"
    Build Tools:
      - 35.0.0
      - 36.0.0
      - 36.1.0
      - 37.0.0
    System Images:
      - android-36 | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2025.3 AI-253.32098.37.2534.15232325
  Xcode:
    version: 26.6/17F113
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.18
    path: /Library/Java/JavaVirtualMachines/zulu-17.jdk/Contents/Home/bin/javac
  Ruby:
    version: 3.4.7
    path: /opt/homebrew/opt/ruby@3.4/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.1.0
    wanted: 20.1.0
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.85.3
    wanted: ^0.85.3
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

No trace

MANDATORY Reproducer

Reproducer: https://github.com/facebook/react-native/pull/58449

Screenshots and Videos

No response

packages/react-native/Libraries/Components/TextInput/TextInput.js の InternalTextInput にある onSelectionChangeShouldSetResponder の2つの出現箇所から始め、必須の再現 PR #58449 を調査します。両方の分岐が、要求されたタッチ履歴の条件と呼び出し元によるオーバーライドをサポートしていることを確認します。アクティブなタッチなしでの選択変更が responder を取得せず、ドラッグによる選択では引き続き取得でき、呼び出し元が独自の handler を提供できれば完了です。