IssueTracker

Also fails using HorizontalPageIndicator with Accompanist Pager.

```
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.google.android.horologist.sample.debug, PID: 8306
    java.lang.IndexOutOfBoundsException: Index 0 is out of bounds. The list has 0 elements.
        at androidx.compose.runtime.collection.MutableVectorKt.checkIndex(MutableVector.kt:1134)
        at androidx.compose.runtime.collection.MutableVectorKt.access$checkIndex(MutableVector.kt:1)
        at androidx.compose.runtime.collection.MutableVector$MutableVectorList.get(MutableVector.kt:939)
        at androidx.wear.compose.foundation.CurvedComposableChild.initializeMeasure(CurvedComposable.kt:66)
        at androidx.wear.compose.foundation.ContainerChild.initializeMeasure(CurvedContainer.kt:71)
        at androidx.wear.compose.foundation.CurvedLayoutKt$CurvedLayout$2.measure-3p2s80s(CurvedLayout.kt:133)
        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1342)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1341)
        at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:126)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:88)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:76)
        at androidx.compose.ui.node.LayoutNode.performMeasure-BRTryo0$ui_release(LayoutNode.kt:1341)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:94)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.measure-BRTryo0(OuterMeasurablePlaceable.kt:75)
        at androidx.compose.ui.node.LayoutNode.measure-BRTryo0(LayoutNode.kt:1284)
        at androidx.compose.foundation.layout.BoxKt$boxMeasurePolicy$1.measure-3p2s80s(Box.kt:135)
        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
        at androidx.compose.foundation.layout.FillModifier.measure-3p2s80s(Size.kt:658)
        at androidx.compose.ui.node.ModifiedLayoutNode.measure-BRTryo0(ModifiedLayoutNode.kt:40)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1342)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1341)
        at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:126)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:88)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:76)
        at androidx.compose.ui.node.LayoutNode.performMeasure-BRTryo0$ui_release(LayoutNode.kt:1341)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:94)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.measure-BRTryo0(OuterMeasurablePlaceable.kt:75)
        at androidx.compose.ui.node.LayoutNode.measure-BRTryo0(LayoutNode.kt:1284)
        at androidx.compose.foundation.layout.BoxKt$boxMeasurePolicy$1.measure-3p2s80s(Box.kt:113)
        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1342)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1341)
        at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:126)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:88)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:76)
        at androidx.compose.ui.node.LayoutNode.performMeasure-BRTryo0$ui_release(LayoutNode.kt:1341)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:94)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.measure-BRTryo0(OuterMeasurablePlaceable.kt:75)
        at androidx.compose.ui.node.LayoutNode.measure-BRTryo0(LayoutNode.kt:1284)
E/AndroidRuntime:     at androidx.compose.foundation.layout.BoxKt$boxMeasurePolicy$1.measure-3p2s80s(Box.kt:135)
        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
        at androidx.compose.foundation.layout.FillModifier.measure-3p2s80s(Size.kt:658)
        at androidx.compose.ui.node.ModifiedLayoutNode.measure-BRTryo0(ModifiedLayoutNode.kt:40)
        at androidx.compose.foundation.layout.OffsetPxModifier.measure-3p2s80s(Offset.kt:200)
        at androidx.compose.ui.node.ModifiedLayoutNode.measure-BRTryo0(ModifiedLayoutNode.kt:40)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1342)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1341)
        at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:126)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:88)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:76)
        at androidx.compose.ui.node.LayoutNode.performMeasure-BRTryo0$ui_release(LayoutNode.kt:1341)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:94)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.measure-BRTryo0(OuterMeasurablePlaceable.kt:75)
        at androidx.compose.ui.node.LayoutNode.measure-BRTryo0(LayoutNode.kt:1284)
        at androidx.compose.foundation.layout.BoxKt$boxMeasurePolicy$1.measure-3p2s80s(Box.kt:113)
        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
        at androidx.compose.foundation.layout.FillModifier.measure-3p2s80s(Size.kt:658)
        at androidx.compose.ui.node.ModifiedLayoutNode.measure-BRTryo0(ModifiedLayoutNode.kt:40)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1342)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1341)
        at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:126)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:88)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:76)
        at androidx.compose.ui.node.LayoutNode.performMeasure-BRTryo0$ui_release(LayoutNode.kt:1341)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:94)
        at androidx.compose.ui.node.LayoutNode.remeasure-_Sx5XlM$ui_release(LayoutNode.kt:1295)
        at androidx.compose.ui.node.LayoutNode.remeasure-_Sx5XlM$ui_release$default(LayoutNode.kt:1291)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.doRemeasure-sdFAvZA(MeasureAndLayoutDelegate.kt:180)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.remeasureAndRelayoutIfNeeded(MeasureAndLayoutDelegate.kt:256)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.forceMeasureTheSubtree(MeasureAndLayoutDelegate.kt:299)
        at androidx.compose.ui.platform.AndroidComposeView.forceMeasureTheSubtree(AndroidComposeView.android.kt:723)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:106)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.measure-BRTryo0(OuterMeasurablePlaceable.kt:75)
        at androidx.compose.ui.node.LayoutNode.measure-BRTryo0(LayoutNode.kt:1284)
        at androidx.compose.foundation.layout.BoxKt$boxMeasurePolicy$1.measure-3p2s80s(Box.kt:135)
        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
        at androidx.compose.foundation.layout.FillModifier.measure-3p2s80s(Size.kt:658)
        at androidx.compose.ui.node.ModifiedLayoutNode.measure-BRTryo0(ModifiedLayoutNode.kt:40)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1342)
        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1341)
        at androidx.compose.runtime.snapshots.Snapshot$Companion.observe(Snapshot.kt:1918)
E/AndroidRuntime:     at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:121)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:88)
        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:76)
        at androidx.compose.ui.node.LayoutNode.performMeasure-BRTryo0$ui_release(LayoutNode.kt:1341)
        at androidx.compose.ui.node.OuterMeasurablePlaceable.remeasure-BRTryo0(OuterMeasurablePlaceable.kt:94)
        at androidx.compose.ui.node.LayoutNode.remeasure-_Sx5XlM$ui_release(LayoutNode.kt:1295)
        at androidx.compose.ui.node.LayoutNode.remeasure-_Sx5XlM$ui_release$default(LayoutNode.kt:1291)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.doRemeasure-sdFAvZA(MeasureAndLayoutDelegate.kt:180)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.remeasureAndRelayoutIfNeeded(MeasureAndLayoutDelegate.kt:256)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.access$remeasureAndRelayoutIfNeeded(MeasureAndLayoutDelegate.kt:36)
        at androidx.compose.ui.node.MeasureAndLayoutDelegate.measureAndLayout(MeasureAndLayoutDelegate.kt:201)
        at androidx.compose.ui.platform.AndroidComposeView.onMeasure(AndroidComposeView.android.kt:756)
        at android.view.View.measure(View.java:25495)
        at androidx.compose.ui.platform.AbstractComposeView.internalOnMeasure$ui_release(ComposeView.android.kt:298)
        at androidx.compose.ui.platform.AbstractComposeView.onMeasure(ComposeView.android.kt:285)
        at android.view.View.measure(View.java:25495)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6961)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at android.view.View.measure(View.java:25495)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6961)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:747)
        at android.view.View.measure(View.java:25495)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3413)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:2244)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2502)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1968)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8199)
        at android.view.Choreographer$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$FrameDisplayEventReceiver.run(Choreographer.java:957)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7651)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
```

So need to wrap protectively

```
        if (pagerScreenState.pageCount > 0) {
            HorizontalPageIndicator(pageIndicatorState = pagerScreenState)
        }
```

Should be fixed on 1.0.0-Alpha20

Still failing in Alpha20 -

```
 java.lang.IndexOutOfBoundsException: Index 0 is out of bounds. The list has 0 elements.
                                                                                                        at androidx.compose.runtime.collection.MutableVectorKt.checkIndex(MutableVector.kt:1134)
                                                                                                        at androidx.compose.runtime.collection.MutableVectorKt.access$checkIndex(MutableVector.kt:1)
                                                                                                        at androidx.compose.runtime.collection.MutableVector$MutableVectorList.get(MutableVector.kt:939)
                                                                                                        at androidx.wear.compose.foundation.CurvedComposableChild.initializeMeasure(CurvedComposable.kt:67)
                                                                                                        at androidx.wear.compose.foundation.ContainerChild.initializeMeasure(CurvedContainer.kt:71)
                                                                                                        at androidx.wear.compose.foundation.CurvedLayoutKt$CurvedLayout$2.measure-3p2s80s(CurvedLayout.kt:132)
                                                                                                        at androidx.compose.ui.node.InnerPlaceable.measure-BRTryo0(InnerPlaceable.kt:46)
                                                                                                        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1334)
                                                                                                        at androidx.compose.ui.node.LayoutNode$performMeasure$1.invoke(LayoutNode.kt:1333)
                                                                                                        at androidx.compose.runtime.snapshots.Snapshot$Companion.observe(Snapshot.kt:2063)
                                                                                                        at androidx.compose.runtime.snapshots.SnapshotStateObserver.observeReads(SnapshotStateObserver.kt:112)
                                                                                                        at androidx.compose.ui.node.OwnerSnapshotObserver.observeReads$ui_release(OwnerSnapshotObserver.kt:78)
                                                                                                        at androidx.compose.ui.node.OwnerSnapshotObserver.observeMeasureSnapshotReads$ui_release(OwnerSnapshotObserver.kt:66)
```

Right, that's another one (initial report was throwing on CurvedRowChild, this is on CurvedComposableChild).
I'll take a look.

Project: platform/frameworks/support
Branch: androidx-main

commit 27006a9d89bb5416e5da36478e20475c71e50681
Author: Sergio Sancho <ssancho@google.com>
Date:   Mon Apr 11 11:39:57 2022

    Fix bug for a CurvedLayout changing children on a SideEffect.
   
    Previously, the internal "curved tree" was updated in the main
    dereivedStateOf on CurvedLayout when a container changed it's content.
    This may cause it to be out of sync with compose's tree.
    Now, we update our tree during composition, so they are kept sync.
    Relnote: "Bug fix for https://issuetracker.google.com/issues/226648931"
    Test: Added regresion test
    Bug: 226648931
   
    Change-Id: Ia0a0aa4e2e480814665f0687af41506842f36de6

M       wear/compose/compose-foundation/src/commonMain/kotlin/androidx/wear/compose/foundation/CurvedLayout.kt
M       wear/compose/compose-foundation/src/commonMain/kotlin/androidx/wear/compose/foundation/CurvedContainer.kt
M       wear/compose/compose-foundation/src/androidAndroidTest/kotlin/androidx/wear/compose/foundation/CurvedLayoutTest.kt

https://android-review.googlesource.com/2059971