Accessibility. Crash on Windows when traversing elements about compose-multiplatform

[mgroth0]

Something like this is occurring for me as well on Desktop.

I am running:

• MacOS 14.5
• Java 20
• Kotlin 2.0.0-RC1
• Compose 1.6.10

Click here to see stack trace

java.lang.IndexOutOfBoundsException: index: -707, size: 1
	at kotlin.collections.AbstractList$Companion.checkElementIndex$kotlin_stdlib(AbstractList.kt:108)
	at kotlin.collections.builders.ListBuilder.get(ListBuilder.kt:39)
	at androidx.compose.ui.platform.a11y.ComposeAccessible$ComposeAccessibleComponent.getAccessibleChild(ComposeAccessible.kt:337)
	at androidx.compose.ui.platform.a11y.ComposeAccessible$ComposeAccessibleComponent.getAccessibleAt(ComposeAccessible.kt:380)
	at androidx.compose.ui.platform.a11y.ComposeAccessible$ComposeAccessibleComponent.getAccessibleAt(ComposeAccessible.kt:381)
	at androidx.compose.ui.platform.a11y.ComposeSceneAccessible$ComposeSceneAccessibleContext.getAccessibleAt(ComposeSceneAccessible.kt:89)
	at java.desktop/sun.lwawt.macosx.CAccessibility$23.call(CAccessibility.java:501)
	at java.desktop/sun.lwawt.macosx.CAccessibility$23.call(CAccessibility.java:471)
	at java.desktop/sun.lwawt.macosx.LWCToolkit$CallableWrapper.run(LWCToolkit.java:701)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:308)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.executePrivileged(AccessController.java:778)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:98)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:747)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
	at java.base/java.security.AccessController.executePrivileged(AccessController.java:778)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:744)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

I first started seeing this after putting together a complex UI with a very large amount of code behind it (this was also shortly after updating to 1.6.10). I expect it will take me a while to extract out a reproducer. I can, however, easily reproduce the issue in my own app. It is non-deterministic; I have to try the same thing a few times before the exception is thrown.

[mgroth0]

Well, I was totally wrong about this being hard to reproduce. It was actually fast and easy.

Reproducer:

1. Launch app
2. Hover mouse above one of the "world" texts
3. Scroll down
4. Move mouse to the right, above the empty space
5. Click

import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material3.Text
import androidx.compose.ui.window.Window
import androidx.compose.ui.window.application

fun main() {
    application {
        Window(
            onCloseRequest = ::exitApplication
        ) {
            LazyColumn {
                item {
                    Text("Hello")
                }
                item {
                    repeat(100) {
                        Text("World")
                    }
                }
            }
        }
    }
}

Click here to see stack trace

java.lang.IndexOutOfBoundsException: index: -1, size: 1
	at kotlin.collections.AbstractList$Companion.checkElementIndex$kotlin_stdlib(AbstractList.kt:108)
	at kotlin.collections.builders.ListBuilder.get(ListBuilder.kt:39)
	at androidx.compose.ui.platform.a11y.ComposeAccessible$ComposeAccessibleComponent.getAccessibleChild(ComposeAccessible.kt:337)
	at androidx.compose.ui.platform.a11y.ComposeAccessible$ComposeAccessibleComponent.getAccessibleAt(ComposeAccessible.kt:380)
	at androidx.compose.ui.platform.a11y.ComposeAccessible$ComposeAccessibleComponent.getAccessibleAt(ComposeAccessible.kt:381)
	at androidx.compose.ui.platform.a11y.ComposeSceneAccessible$ComposeSceneAccessibleContext.getAccessibleAt(ComposeSceneAccessible.kt:89)
	at java.desktop/sun.lwawt.macosx.CAccessibility$23.call(CAccessibility.java:501)
	at java.desktop/sun.lwawt.macosx.CAccessibility$23.call(CAccessibility.java:471)
	at java.desktop/sun.lwawt.macosx.LWCToolkit$CallableWrapper.run(LWCToolkit.java:701)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:308)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.executePrivileged(AccessController.java:778)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:98)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:747)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
	at java.base/java.security.AccessController.executePrivileged(AccessController.java:778)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:744)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)