Crash when using `rememberWindowState`: DpSize is unspecified

[iamcalledrob]

Describe the bug rememberWindowState() causes a crash: java.lang.IllegalStateException: DpSize is unspecified

The relevant part of the stack trace is this: at androidx.compose.ui.window.WindowStateImpl$Companion$Saver$1.invoke(WindowState.desktop.kt:230)

fun Saver(unspecifiedPosition: WindowPosition) = listSaver<WindowState, Any>(

    save = {

        listOf(

            it.placement.ordinal,

            it.isMinimized,

            it.position.isSpecified,

            it.position.x.value,

            it.position.y.value,

            it.size.width.value,
  // <-- Attempting a direct read of Dp.value,
            it.size.height.value,
 // <-- which throws when Unspecified
        )

    },
    .....

DpSize.Unspecified is a valid initial value for WindowState, but it appears that the state saver can't accommodate it. I am only seeing this crash within certain composable hierarchies, so perhaps there's a condition where the saver is invoked before the window has calculated its real size?

Affected platforms

• Desktop (Windows, Linux, macOS)

Versions

• Libraries:

  • Compose Multiplatform version: 1.6.2

• Kotlin version: 1.9.22

• OS version(s) (required for Desktop and iOS issues): Windows 11, up-to-date.

• OS architecture (x86 or arm64): x86

• JDK (for desktop issues): Termurin 17

To Reproduce Steps to reproduce the behavior:

1. Run this code snippet:

   fun main() = application {
   
    Window(onCloseRequest = ::exitApplication) {
   
        LazyColumn {

           item {
   
                rememberWindowState(size = DpSize.Unspecified)

           }

       }

   }
   
}

Expected behavior A clear and concise description of what you expected to happen.

Additional context This also affects rememberDialogState. The impact of this bug is that I'm unable to open dialogs from within lazy list items.

As a workround, remember { WindowState(size = DpSize.Unspecified) } works, since it doesn't invoke rememberSaveable.