Fixes jumpy thread view

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt

@@ -21,7 +21,11 @@
 package com.vitorpamplona.amethyst.ui.screen
 
 import android.util.Log
+import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.runtime.Stable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
@@ -268,6 +272,8 @@ abstract class FeedViewModel(
 
     override fun invalidateData(ignoreIfDoing: Boolean) = feedState.invalidateData(ignoreIfDoing)
 
+    var llState: LazyListState by mutableStateOf(LazyListState(0, 0))
+
     private var collectorJob: Job? = null
 
     init {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/threadview/ThreadFeedView.kt

@@ -35,7 +35,6 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.itemsIndexed
-import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
@@ -210,17 +209,15 @@ fun ThreadFeedView(
     accountViewModel: AccountViewModel,
     nav: INav,
 ) {
-    val listState = rememberLazyListState()
-
     RefresheableBox(viewModel) {
         RenderFeedState(
             viewModel = viewModel,
             accountViewModel = accountViewModel,
-            listState = listState,
+            listState = viewModel.llState,
             nav = nav,
             routeForLastRead = null,
             onLoaded = {
-                RenderThreadFeed(noteId, it, listState, accountViewModel, nav)
+                RenderThreadFeed(noteId, it, viewModel.llState, accountViewModel, nav)
             },
         )
     }