As the

TopAppBar

is scrolled,

Scaffold's

content is recomposed (which makes sense since

innerPadding

is changing). I would expect

MyContent

to be skipped (since it takes a stable lambda and a parameter that is set to a

Boolean

literal), but it is called on every recompose. However, if I hardcode

MyContent's

isVisible = true

instead of

isVisible = isVisible

then it does get skipped.

@Composable
fun Test() {
  MyContentWrapper(
    content = {},
    isVisible = true
  )
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
private fun MyContentWrapper(
  content: @Composable () -> Unit,
  isVisible: Boolean = true
) {
  Scaffold(
    topBar = {
      TopAppBar(
        title = { Text(text = "TopAppBar") },
        scrollBehavior = TopAppBarDefaults.enterAlwaysScrollBehavior()
      )
    }
  ) { innerPadding ->
    Box(
      modifier = Modifier.padding(innerPadding)
    ) {
      MyContent(
        content = content,
        isVisible = isVisible
      )
    }
  }
}

@Composable
private fun MyContent(
  content: @Composable () -> Unit,
  isVisible: Boolean
) {
  Log.e("TEST", "RECOMPOSE")
  if(isVisible) {
    content()
  }
}

If I wrap the

Boolean

in an

Immutable

data class even outside the scope of

Scaffold

then it doesn't recompose.

I don't know enough about SubcomposeLayout sorry, you could try file a bug if you don't get a better answer