IssueTracker

Hi,

It's about a some fix for FAB. The problem is AnimatedVisibility default animation expandIn include ChangeSize and it's default value is IntSize(0, 0). When it size was Zero, the FAB doesn't draw when recomposition. If this bug comes from production, you can fix it like below.

var flag by remember { mutableStateOf(true) }
Scaffold(
    floatingActionButton = {
        AnimatedVisibility(
            visible = flag,
            enter = fadeIn() + expandIn { IntSize(width = 1, height = 1) })
        {
            FloatingActionButton(onClick = {}) {
                Icon(Icons.Default.ArrowBack, null)
            }
        }
    },
) {
    Switch(flag, { flag = it })
}

Chage: https://android-review.googlesource.com/c/platform/frameworks/support/+/2022695

expandIn { IntSize ... fix works, but has the same problem as with wrapping AnimatedVisibility in fixed size Box: the shadow is cropped during the transition, as can be seen in the withBox.gif attached to original post.