Toolbar scroll fixed

feature/author/src/main/java/com/google/samples/apps/nowinandroid/feature/author/AuthorScreen.kt

@@ -17,6 +17,7 @@
 package com.google.samples.apps.nowinandroid.feature.author
 
 import androidx.annotation.VisibleForTesting
+import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -27,7 +28,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawing
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.windowInsetsBottomHeight
-import androidx.compose.foundation.layout.windowInsetsTopHeight
+import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListScope
 import androidx.compose.foundation.lazy.rememberLazyListState
@@ -83,6 +84,7 @@ internal fun AuthorRoute(
     )
 }
 
+@OptIn(ExperimentalFoundationApi::class)
 @VisibleForTesting
 @Composable
 internal fun AuthorScreen(
@@ -96,13 +98,10 @@ internal fun AuthorScreen(
     val scrollableState = rememberLazyListState()
     TrackScrollJank(scrollableState = scrollableState, stateName = "author:column")
     LazyColumn(
-        modifier = modifier,
+        modifier = modifier.windowInsetsPadding(WindowInsets.safeDrawing),
         horizontalAlignment = Alignment.CenterHorizontally,
         state = scrollableState
     ) {
-        item {
-            Spacer(Modifier.windowInsetsTopHeight(WindowInsets.safeDrawing))
-        }
         when (authorUiState) {
             AuthorUiState.Loading -> {
                 item {
@@ -116,7 +115,7 @@ internal fun AuthorScreen(
                 TODO()
             }
             is AuthorUiState.Success -> {
-                item {
+                stickyHeader {
                     AuthorToolbar(
                         onBackClick = onBackClick,
                         onFollowClick = onFollowClick,
@@ -204,6 +203,7 @@ private fun AuthorToolbar(
     onBackClick: () -> Unit = {},
     onFollowClick: (Boolean) -> Unit = {},
 ) {
+    NiaBackground {
         Row(
             horizontalArrangement = Arrangement.SpaceBetween,
             verticalAlignment = Alignment.CenterVertically,
@@ -233,6 +233,7 @@ private fun AuthorToolbar(
             }
         }
     }
+}
 
 @DevicePreviews
 @Composable