IssueTracker

Compose BOM version: 2024.12.01.
Jetpack Compose component used: FocusRestorer.
Android Studio Build: Android Studio Ladybug | 2024.2.1.
Kotlin version: 2.0.0

Problem

Focushandling on TV with multiple Rows in a LazyColumn where the first Row is aligned at the bottom of the screen. When navigating up an down between the rows, the focus sometimes skips 1 or more rows.

Reproduce

1. Navigate down two times
2. Navigate up once and one tile to the right
3. Navigate up once more
4. When navigating down the second row is skipped

fun Modifier.overrideBringIntoViewBounds(update: (localRect: Rect) -> Rect): Modifier = bringIntoViewResponder(
    object : BringIntoViewResponder {
        override suspend fun bringChildIntoView(localRect: () -> Rect?) {}
        override fun calculateRectForParent(localRect: Rect): Rect = update(localRect)
    },
)

@Composable
private fun TestContent() {
    LazyColumn(contentPadding = PaddingValues(24.dp)) {
        item {
            val height = LocalConfiguration.current.screenHeightDp * 0.6
            Column(
                modifier = Modifier
                    .fillMaxWidth()
                    .overrideBringIntoViewBounds { it.copy(top = 0F) },
            ) {
                Box(modifier = Modifier
                    .height(height.dp)
                    .fillMaxWidth()
                    .background(Color.Gray))
                ContentRow()
            }
        }

        repeat(100) { item { ContentRow() } }
    }
}

@Composable
private fun ContentRow() {
    LazyRow(modifier = Modifier.focusRestorer()) {
        items(10) {
            Card(
                modifier = Modifier
                    .padding(horizontal = 24.dp, vertical = 16.dp)
                    .size(170.dp), onClick = {},
            ) {}
        }
    }
}

Comment

Spend a lot of time searching for a fix. In the end I wrote a custom FocusRestorer which doesn't pin its item when leaving the viewport.
I wrote another bug regarding the pinning, because no item will be disposed after scrolling it out of the viewport when using FocusRestorer. Which could result in bad perfomance results when you are using a huge amount of items.