showCallkitIncoming not working with --obfuscate

[mschudt]

FlutterCallkitIncoming.showCallkitIncoming(params) does not work (tested on Android) when called while the app is in the background and Dart obfuscation is enabled. I have already tried excluding flutter_callkit_incoming with -keep class com.hiennv.flutter_callkit_incoming.** { *; } in the proguard-rules.pro as well as: shrinkResources false minifyEnabled false useProguard false in build.gradle but nothing seems to have an effect on this. The only way this works with a release build is to exclude --obfuscate and --split-debug-info from the build command.