GoogleMap widget redraws map elements in every build #37174
Description
GoogleMap widget redraws all elements on the map no matter if they changed or not every time the widget is built.
For example if there is a polygon drawn on the map and the widget is built again, it will tell native implementation to update the polygon even though there is no change.
This behavior can produce performance problems if there are a lot of elements drawn on the map.
Steps to Reproduce
- Create a simple Flutter app with a
GoogleMapwidget. - Fill the map with some polygons.
- Interact with the map (I.e. move the map).
- See how the polygons blink because they are redrawn.
Logs
[✓] Flutter (Channel stable, v1.7.8+hotfix.3, on Mac OS X 10.14.5 18F132, locale en-ES)
• Flutter version 1.7.8+hotfix.3 at /Users/pau/Library/Flutter
• Framework revision b712a172f9 (3 weeks ago), 2019-07-09 13:14:38 -0700
• Engine revision 54ad777fd2
• Dart version 2.4.0
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at /Users/pau/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 10.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.3, Build version 10G8
• CocoaPods version 1.7.4
[✓] iOS tools - develop for iOS devices
• ios-deploy 1.9.4
[✓] Android Studio (version 3.4)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 37.1.1
• Dart plugin version 183.6270
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
[✓] IntelliJ IDEA Community Edition (version 2018.3.6)
• IntelliJ at /Applications/IntelliJ IDEA CE.app
• Flutter plugin version 31.3.4
• Dart plugin version 183.4886.3
[✓] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)
• No issues found!