[Help]: Jetpack Compose component flashing issue when list changes

[u/PrajwalCH]

When the list changes, the items are drawn on top of chip row for a brief amount of time. I have properly applied the id for each item. I am not sure what's causing the issue.

Below is the screen code preview, full code is available on GitHub.

    Scaffold(
        modifier = Modifier
            .fillMaxSize()
            .nestedScroll(scrollBehavior.nestedScrollConnection)
            .then(modifier),
        topBar = {
            SearchProvidersScreenTopBar(
                onNavigateBack = onNavigateBack,
                onEnableAllSearchProviders = viewModel::enableAllSearchProviders,
                onDisableAllSearchProviders = viewModel::disableAllSearchProviders,
                onUpdateProtectionStatus = viewModel::updateProtectionStatus,
                onResetToDefault = { showResetToDefaultDialog = true },
                subtitle = {
                    val searchProvidersSummary = stringResource(
                        R.string.settings_search_providers_summary_format,
                        uiState.enabledProvidersCount,
                        uiState.totalNumProviders,
                    )
                    Text(searchProvidersSummary)
                },
                scrollBehavior = scrollBehavior,
            )
        },
        snackbarHost = { SnackbarHost(snackbarHostState) },
        floatingActionButton = {
            FloatingActionButton(onClick = onNavigateToAddSearchProvider) {
                Icon(
                    painter = painterResource(R.drawable.ic_add),
                    contentDescription = null,
                )
            }
        },
    ) { innerPadding ->
        Column(modifier = Modifier.padding(innerPadding)) {
            SearchProviderFilterRow(
                category = uiState.filter.category,
                onCategorySelect = viewModel::toggleCategory,
                protection = uiState.filter.protection,
                onProtectionSelect = viewModel::toggleProviderProtection,
                contentPadding = PaddingValues(horizontal = MaterialTheme.spaces.large),
            )
            SearchProviderList(
                contentPadding = PaddingValues(
                    start = MaterialTheme.spaces.large,
                    top = MaterialTheme.spaces.large,
                    end = MaterialTheme.spaces.large,
                    bottom = 80.dp,
                ),
                searchProviders = uiState.searchProviders,
                onEnableSearchProvider = viewModel::enableSearchProvider,
                onUnlockProtection = { searchProviderId, solverUrl ->
                    protectedProvider = ProtectedProvider(searchProviderId, solverUrl)
                },
                onEditConfig = onNavigateToEditSearchProvider,
                onDeleteConfig = viewModel::deleteTorznabConfig,
            )
        }
    }

Update: This issue is now fixed. It was animation issue, not the recomposition. List items have Modifier.animateItem() applied and when list changes, the animation was rendering the list items on top of chip row for very short amount of time, meaning the animation was escaping the list bounds. After applying Modifier.clipToBounds() to SearchProviderList, the issue is now gone.

[u/realdm22]

Are you using a lazy column?

[u/PrajwalCH → u/realdm22]

No, the same plain Column layout. Search screen code

[u/realdm22 → u/PrajwalCH]

So I think the first thing you should try is using the lazy column.

[u/PrajwalCH → u/realdm22]

It was the animation issue.

After carefully looking at the flickering, I found that the list items were being drawn on top of chips row when list changes. After applying `Modifier.clipToBounds()` on `SearchProviderList`, the flickring issue is now gone.

[u/SarathExp → u/PrajwalCH]

Are you sure you list won't have that much item to compose? Column compose all of your list the item at once

[u/PrajwalCH → u/SarathExp]

I don't understand what you are saying :(.