IMPORTANT: Please read https://developer.android.com/studio/report-bugs.html carefully and supply all required information.

Android Studio Build: 4.1 Canary 9

Version of Gradle Plugin: 4.1.0-alpha09

Version of Gradle: 6.4

Version of Kotlin: 1.3.70

OS: Arch Linux

Version of Compose: dev-11

Steps to Reproduce:

Use the following code in setContent and run app

   MaterialTheme {
       for (x in 0..2) {
           HorizontalScroller {

           }
       }
   }

Result: Crash with stacktrack:

2020-05-18 18:29:27.344 7786-7786/com.vanpra.composeviewpager E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.vanpra.composeviewpager, PID: 7786
    java.lang.IllegalArgumentException: Key -1675089381 was already registered. Please call unregister before registering again
        at androidx.ui.savedinstancestate.UiSavedStateRegistryImpl.registerProvider(UiSavedStateRegistry.kt:97)
        at androidx.ui.savedinstancestate.ValueProvider.updateAndReturnValue(RememberSavedInstanceState.kt:101)
        at androidx.ui.savedinstancestate.RememberSavedInstanceStateKt.rememberSavedInstanceState(RememberSavedInstanceState.kt:66)
        at androidx.ui.savedinstancestate.RememberSavedInstanceStateKt.rememberSavedInstanceState$default(RememberSavedInstanceState.kt:53)
        at androidx.ui.foundation.ScrollerKt.ScrollerPosition(Scroller.kt:62)
        at androidx.ui.foundation.ScrollerKt.ScrollerPosition$default(Scroller.kt:57)
        at androidx.ui.foundation.ScrollerKt.HorizontalScroller$default(Scroller.kt:237)
        at com.vanpra.composeviewpager.MainActivity$onCreate$1$1.invoke(MainActivity.kt:25)
        at com.vanpra.composeviewpager.MainActivity$onCreate$1$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.compose.AmbientKt.Providers(Ambient.kt:175)
        at androidx.ui.foundation.TextKt.ProvideTextStyle(Text.kt:257)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1.invoke(MaterialTheme.kt:98)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.compose.AmbientKt.Providers(Ambient.kt:175)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1.invoke(MaterialTheme.kt:98)
        at androidx.ui.material.MaterialThemeKt$MaterialTheme$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.compose.AmbientKt.Providers(Ambient.kt:175)
        at androidx.ui.material.ColorKt.ProvideColorPalette(Color.kt:331)
        at androidx.ui.material.MaterialThemeKt.MaterialTheme(MaterialTheme.kt:98)
        at androidx.ui.material.MaterialThemeKt.MaterialTheme$default(MaterialTheme.kt:49)
        at com.vanpra.composeviewpager.MainActivity$onCreate$1.invoke(MainActivity.kt:25)
        at com.vanpra.composeviewpager.MainActivity$onCreate$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.ui.core.selection.SelectionContainerKt$SelectionContainer$5$1.invoke(SelectionContainer.kt:238)
        at androidx.ui.core.selection.SelectionContainerKt$SelectionContainer$5$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.ui.core.LayoutKt.Layout(Layout.kt:675)
        at androidx.ui.core.LayoutKt.Layout(Layout.kt:630)
        at androidx.ui.core.selection.SelectionContainerKt.Wrap(SelectionContainer.kt:319)
        at androidx.ui.core.selection.SelectionContainerKt.access$Wrap(Unknown Source:0)
        at androidx.ui.core.selection.SelectionContainerKt$SelectionContainer$5.invoke(SelectionContainer.kt:238)
        at androidx.ui.core.selection.SelectionContainerKt$SelectionContainer$5.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.compose.AmbientKt.Providers(Ambient.kt:175)
        at androidx.ui.core.selection.SelectionContainerKt.SelectionContainer(SelectionContainer.kt:303)
        at androidx.ui.core.selection.SelectionContainerKt.SelectionContainer(SelectionContainer.kt:262)
        at androidx.ui.core.WrapperKt.WrapWithSelectionContainer(Wrapper.kt:497)
2020-05-18 18:29:27.345 7786-7786/com.vanpra.composeviewpager E/AndroidRuntime:     at androidx.ui.core.WrapperKt.access$WrapWithSelectionContainer(Unknown Source:0)
        at androidx.ui.core.WrappedComposition$setContent$1$1.invoke(Wrapper.kt:497)
        at androidx.ui.core.WrappedComposition$setContent$1$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.compose.AmbientKt.Providers(Ambient.kt:175)
        at androidx.ui.core.WrapperKt.WrapWithAmbients(Wrapper.kt:546)
        at androidx.ui.core.WrapperKt.access$WrapWithAmbients(Unknown Source:0)
        at androidx.ui.core.WrappedComposition$setContent$1.invoke(Wrapper.kt:497)
        at androidx.ui.core.WrappedComposition$setContent$1.invoke(Unknown Source:2)
        at androidx.compose.internal.RestartableFunction.invoke(RestartableFunction.kt:131)
        at androidx.compose.internal.RestartableFunction.invoke(Unknown Source:2)
        at androidx.compose.ComposerKt.invokeComposable(Composer.kt:2247)
        at androidx.compose.Recomposer.recompose$compose_runtime_release(Recomposer.kt:67)
        at androidx.compose.CompositionImpl.setContent(Composition.kt:120)
        at androidx.ui.core.WrappedComposition.setContent(Wrapper.kt:267)
        at androidx.ui.core.WrappedComposition$setContent$2.invoke(Wrapper.kt:278)
        at androidx.ui.core.WrappedComposition$setContent$2.invoke(Unknown Source:2)
        at androidx.ui.core.SavedStateDelegate.stopWaitingForStateRestoration(SavedStateDelegate.kt:84)
        at androidx.ui.core.AndroidComposeView.onMeasure(AndroidOwner.kt:484)
        at android.view.View.measure(View.java:25362)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6859)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
        at android.view.View.measure(View.java:25362)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6859)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
        at android.view.View.measure(View.java:25362)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6859)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at android.view.View.measure(View.java:25362)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6859)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
        at android.view.View.measure(View.java:25362)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6859)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:739)
        at android.view.View.measure(View.java:25362)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3329)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:2175)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2432)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1906)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8089)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:972)
        at android.view.Choreographer.doCallbacks(Choreographer.java:796)
        at android.view.Choreographer.doFrame(Choreographer.java:731)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:957)
        at android.os.Handler.handleCallback(Handler.java:907)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7478)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)a

I believe that this might be due to the fact that the HorizontalScroller is being treated the same for each iteration of the loop meaning that the HorizontalScroller is initalised with a ScrollerPosition with rememberSavedInstanceState with the same id causing a conflict and hence crashing