[mustache_template] Emoji support #176180
Description
Steps to reproduce
With mustache_template version 2.0.1, emojis are not currently working.
- Render a template with emojis and at least a new line.
Expected results
Non broken result
Actual results
The rendered String is broken because emoji sizes are not taken into consideration
Code sample
Code sample
final source = 'Hello! 🖖👍🏽\nBye! 🏳️🌈';
final result = Template(source).renderString(null);
print("Source:");
print(source);
print("------------");
print("Result:");
print(result);Screenshots or Video
Screenshots / Video demonstration
[Upload media here]
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.32.8, on Fedora Linux 42 (Workstation Edition) 6.16.8-200.fc42.x86_64, locale en_US.UTF-8) [119ms]
• Flutter version 3.32.8 on channel stable at /home/david/.local/share/mise/installs/flutter/3.32.8-stable
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision edada7c56e (9 weeks ago), 2025-07-25 14:08:03 +0000
• Engine revision ef0cd00091
• Dart version 3.8.1
• DevTools version 2.45.1
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [1,594ms]
• Android SDK at /home/david/Android/Sdk/
• Platform android-36, build-tools 35.0.0
• Java binary at: /home/david/.jdks/jbr-17.0.14/bin/java
This JDK is specified in your Flutter configuration.
To change the current JDK, run: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment JBR-17.0.14+1-1367.22-nomod (build 17.0.14+1-b1367.22)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Chrome - develop for the web [18ms]
• Chrome at google-chrome
[✓] Linux toolchain - develop for Linux desktop [199ms]
• clang version 20.1.8 (Fedora 20.1.8-4.fc42)
• cmake version 3.31.6
• ninja version 1.12.1
• pkg-config version 2.3.0
! Unable to access driver information using 'eglinfo'.
It is likely available from your distribution (e.g.: apt install mesa-utils)
[✓] Android Studio (version 2025.1.3) [16ms]
• Android Studio at /home/david/opt/android-studio/
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• android-studio-dir = /home/david/opt/android-studio/
• Java version OpenJDK Runtime Environment (build 21.0.7+-13880790-b1038.58)
[✓] VS Code (version unknown) [14ms]
• VS Code at /usr/share/code
• Flutter extension version 3.94.0
✗ Unable to determine VS Code version.
[✓] Connected device (2 available) [125ms]
• Linux (desktop) • linux • linux-x64 • Fedora Linux 42 (Workstation Edition) 6.16.8-200.fc42.x86_64
• Chrome (web) • chrome • web-javascript • Google Chrome 140.0.7339.207
[✓] Network resources [621ms]
• All expected network resources are available.
! Doctor found issues in 1 category.```
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