Text font weight flickers when changing any color value of the AnimatedTheme #30259
Description
Problem
I've tested changing the primarySwatch and the scaffoldBackgroundColor.
When I change a color value in an AnimatedTheme, any text widgets without custom themes will have their font weight reduced for a split second, before turning back to normal. I've written a simple app to show this here.
Example
flutter doctor -v
$ flutter doctor -v
[✓] Flutter (Channel stable, v1.2.1, on Linux, locale en_GB.UTF-8)
• Flutter version 1.2.1 at /home/<USERNAME>/Flutter
• Framework revision 8661d8aecd (6 weeks ago), 2019-02-14 19:19:53 -0800
• Engine revision 3757390fa4
• Dart version 2.1.2 (build 2.1.2-dev.0.0 0a7dcf17eb)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at /home/<USERNAME>/Android/Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: /home/<USERNAME>/.local/share/JetBrains/Toolbox/apps/AndroidStudio/ch-0/191.5409101/jre/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b16-5323222)
• All Android licenses accepted.
[✓] Android Studio (version 3.5)
• Android Studio at /home/<USERNAME>/.local/share/JetBrains/Toolbox/apps/AndroidStudio/ch-0/191.5409101
• Flutter plugin version 34.0.4
• Dart plugin version 191.6183.87
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b16-5323222)
[✓] IntelliJ IDEA Ultimate Edition (version 2019.1.old)
• IntelliJ at /home/<USERNAME>/.local/share/JetBrains/Toolbox/apps/IDEA-JDK11/ch-0/191.6183.87
• Flutter plugin version 34.0.4
• Dart plugin version 191.6183.87
[✓] Connected device (1 available)
• Poco F1 • <SERIAL> • android-arm64 • Android 9 (API 28)
• No issues found!