Looks like Material3 `BottomSheetScaffold` has had a regression - it used to work fine with a LazyCo...

# compose

[dorche]

Looks like Material3 BottomSheetScaffold has had a regression - it used to work fine with a LazyColumn but now the dragging of the sheet is broken if you do it in the bounds of the LazyColumn. Min repro in 🧵

[dorche]

package com.example.bottomsheetrepro

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.material3.BottomSheetScaffold
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.SheetValue
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.rememberBottomSheetScaffoldState
import androidx.compose.material3.rememberStandardBottomSheetState
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Alignment.Companion.CenterHorizontally
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.bottomsheetrepro.ui.theme.BottomSheetReproTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            BottomSheetReproTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {
                    MyBottomSheetScaffold()
                }
            }
        }
    }
}

@Composable
fun MyLazyColmn() {
    Column(
        modifier = Modifier
            .fillMaxWidth()
            .height(200.dp)
            .background(Color.Red)
    ) {
        Text(
            text = "drag/flick works here",
            fontSize = 24.sp,
            modifier = Modifier.align(alignment = CenterHorizontally)
        )
    }
    LazyColumn(
        state = rememberLazyListState(),
    ) {
        item {
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .height(500.dp)
                    .background(Color.Cyan)
            ) {
                Text(
                    text = "but broken here",
                    fontSize = 24.sp,
                    modifier = Modifier.align(Alignment.TopCenter)
                )
            }
        }
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun MyBottomSheetScaffold() {
    BottomSheetScaffold(
        scaffoldState = rememberBottomSheetScaffoldState(
            bottomSheetState = rememberStandardBottomSheetState(SheetValue.PartiallyExpanded)
        ),
        sheetContent = {
            MyLazyColmn()
        },
        sheetDragHandle = null,
    ) {
        Column(
            Modifier
                .fillMaxSize()
                .background(Color.Yellow)
        ) {
            repeat(30) {
                Text(
                    text = "Some text",
                    fontSize = 24.sp,
                    modifier = Modifier.align(alignment = CenterHorizontally)
                )
            }
        }
    }
}

@Preview(showBackground = true)
@Composable
fun ReproPreview() {
    BottomSheetReproTheme {
        MyBottomSheetScaffold()
    }
}

[jw]

File an issue on the issue tracker

[dorche]

Will do, was just recording a video too, here's it as well.

Screen Recording 2023-03-23 at 16.55.23.mov

[dorche]

https://issuetracker.google.com/issues/274872535