IllegalAccessError: Method 'int android.view.View.getWindowAttachCount()' is inaccessible

[mlykotom]

When using Curtains with R8 and the proguard-android-optimize.txt file, it crashes due to missing JavaViewSpy.getWindowAttachCount.

This could be fixed by adding the method to the proguard.

-keepclassmembers class android.view.JavaViewSpy {
    static int windowAttachCount(android.view.View);
}

Stacktrace:

E AndroidRuntime: java.lang.IllegalAccessError: Method 'int android.view.View.getWindowAttachCount()' is inaccessible to class 'android.view.ViewSpyInternalKt' (declaration of 'android.view.ViewSpyInternalKt' appears in /data/app/~~VymduIXOo6hl8tOVtZTVLQ==/com.squareup.curtains.sample-CvXF72T_Jes38DnrA1SIXg==/base.apk)
 E AndroidRuntime: 	at android.view.ViewSpyInternalKt.windowAttachCount(ViewSpyInternal.kt:7)
 E AndroidRuntime: 	at com.example.macrobenchmark.target.ClickTrace$install$1.onRootViewAdded(ClickTrace.kt:7)
 E AndroidRuntime: 	at com.example.macrobenchmark.target.ClickTrace$install$1.onRootViewsChanged(ClickTrace.kt:7)
 E AndroidRuntime: 	at curtains.internal.RootViewsSpy$delegatingViewList$1.add(RootViewsSpy.kt:28)
 E AndroidRuntime: 	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:350)
 E AndroidRuntime: 	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
 E AndroidRuntime: 	at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3880)

Steps to reproduce:

1. Add minification and the default proguard file to the sample app

buildTypes {
    getByName("release") {
      signingConfig = signingConfigs.getByName("debug")
      minifyEnabled(true)
      proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"))
    }
  }

2. Start the sample and observe the crash