Fix emoji insertion corruption by using grapheme-aware text operations by Istiak-Ahmed78 · Pull Request #183112

Fix emoji insertion corruption by using grapheme-aware text operations by Istiak-Ahmed78 · Pull Request #183112 · flutter/flutter

- Update TextEditingValue.replaced() to use grapheme cluster boundaries
  instead of UTF-16 code unit positions to prevent splitting surrogate pairs
- Add TextInput._validateAndCorrectTextEditingValue() to detect and fix
  broken surrogate pairs received from the Android IME
- Intercept platform text updates in _handleTextInputInvocation() to apply
  corrections before updating the text input client

Fixes flutter#181759

bot added a: text input

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Mar 2, 2026