Setting ThemeData.cupertinoOverrideTheme breaks themes equality and causes multiple rebuilds #165455
Description
Steps to reproduce
- Create a new
MaterialAppwith theme set toThemeData(cupertinoOverrideTheme: CupertinoThemeData()). - When the widget with MaterialApp is built it causes dozens of unwanted rebuilds of child widgets, as it's "lerping" between two ThemeData instances which are supposed to be equal.
Similar issue: #89127 (comment)
Expected results
Both instances of ThemeData(cupertinoOverrideTheme: CupertinoThemeData()) are equal.
Actual results
ThemeData instances are not equal.
Code sample
Code sample
var td1 = ThemeData(cupertinoOverrideTheme: CupertinoThemeData());
var td2 = ThemeData(cupertinoOverrideTheme: CupertinoThemeData());
print(td1 == td2); // falseScreenshots or Video
Screenshots / Video demonstration
[Upload media here]
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.29.2, on macOS 15.3.1 24D70
darwin-arm64, locale en-CA) [348ms]
• Flutter version 3.29.2 on channel stable at
/Users/feodor/fvm/versions/3.29.2
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision c236373904 (5 days ago), 2025-03-13
16:17:06 -0400
• Engine revision 18b71d647a
• Dart version 3.7.2
• DevTools version 2.42.3
[✓] Android toolchain - develop for Android devices (Android SDK
version 34.0.0) [1,205ms]
• Android SDK at /Users/feodor/Library/Android/sdk
• Platform android-35, build-tools 34.0.0
• Java binary at:
/Users/feodor/Library/Java/JavaVirtualMachines/jdk-17.0.2+8/C
ontents/Home/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 Temurin-17.0.2+8
(build 17.0.2+8)
• All Android licenses accepted.
[!] Xcode - develop for iOS and macOS (Xcode 16.2) [886ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16C5032a
! CocoaPods 1.14.3 out of date (1.16.2 is recommended).
CocoaPods is a package manager for iOS or macOS platform
code.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/to/platform-plugins
To update CocoaPods, see
https://guides.cocoapods.org/using/getting-started.html#updat
ing-cocoapods
[✓] Chrome - develop for the web [11ms]
• CHROME_EXECUTABLE = /Applications/Microsoft
Edge.app/Contents/MacOS/Microsoft Edge
[✓] Android Studio (version 2022.2) [11ms]
• Android Studio at /Applications/Android Studio.app/Contents
• 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
• Java version OpenJDK Runtime Environment (build
17.0.6+0-17.0.6b802.4-9586694)
[✓] VS Code (version 1.98.0) [10ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.106.0
[✓] Connected device (5 available) [6.1s]
• Feodor’s iPhone 14 Pro (wireless) (mobile) •
00008120-001134213493C01E • ios • iOS
18.3.1 22D72
• iPhone 16 (mobile) •
BF108663-0E31-45CF-8950-67ABC46C5D1A • ios •
com.apple.CoreSimulator.SimRuntime.iOS-18-2 (simulator)
• macOS (desktop) • macos
• darwin-arm64 • macOS 15.3.1 24D70 darwin-arm64
• Mac Designed for iPad (desktop) •
mac-designed-for-ipad • darwin • macOS
15.3.1 24D70 darwin-arm64
• Chrome (web) • chrome
• web-javascript • Microsoft Edge 128.0.2739.63
[✓] Network resources [294ms]
• All expected network resources are available.
! Doctor found issues in 1 category.