[Snapshots] Error when snapshotting preview with Dialog

[rbro112]

There's a crash upon snapshotting a preview that contains a dialog. As a minimal repro:

@Preview
@Composable
fun ConfirmationAlertDialogPreview() {
  SnapshotsSampleTheme {
    Box(
      modifier = Modifier
        .fillMaxSize()
        .background(color = MaterialTheme.colorScheme.background)
    ) {
      // Other UI
      ConfirmationAlertDialog(...)
    }
  }
}

@Composable
fun ConfirmationAlertDialog(
  onDismiss: () -> Unit,
  onConfirm: () -> Unit,
  message: String,
  title: String,
  confirmButtonLabel: String,
  confirmButtonColor: Color = Color.Unspecified,
) {
  AlertDialog(
    onDismissRequest = onDismiss,
    confirmButton = { ... },
    dismissButton = { ... },
    title = { Text(title) },
    text = { Text(message) },
  )
}

Running this with ./gradlew emergeLocalSnapshotsDebug results in a crash with the following stacktrace. The same crash occurs when running on Emerge's cloud snapshotting system.

There was 1 failure:
1) MaterialThemedComponentWithDialog_GenSnapshot(com.emergetools.snapshots.sample.ui.MaterialThemedComponentWithDialog_-1316455265_GenSnapshot)
java.lang.AssertionError: Failed to capture a node to bitmap.
Reason: Expected exactly '1' node but found '2' nodes that satisfy: (isRoot)
Nodes found:
1) Node #11 at (l=0.0, t=77.0, r=1080.0, b=2028.0)px
Has 1 child
2) Node #12 at (l=0.0, t=0.0, r=770.0, b=382.0)px
Has 1 child

        at androidx.compose.ui.test.SemanticsNodeInteraction.fetchOneOrDie(SemanticsNodeInteraction.kt:145)
        at androidx.compose.ui.test.SemanticsNodeInteraction.fetchSemanticsNode(SemanticsNodeInteraction.kt:79)
        at androidx.compose.ui.test.AndroidImageHelpers_androidKt.captureToImage(AndroidImageHelpers.android.kt:51)
        at com.emergetools.snapshots.EmergeSnapshots.take(EmergeSnapshots.kt:72)
        at com.emergetools.snapshots.sample.ui.MaterialThemedComponentWithDialog_-1316455265_GenSnapshot.MaterialThemedComponentWithDialog_GenSnapshot(MaterialThemedComponentWithDialog_-1316455265_GenSnapshot.kt:34)

[rbro112]

We're working on a fix for this! For the time being, we'd recommend adding the @IgnoreEmergeSnapshot annotation to any previews that trigger this issue.