BugFix Loading one thread after another crashed the app

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

@@ -50,6 +50,10 @@ abstract class FeedViewModel(val localFilter: FeedFilter<Note>): ViewModel() {
         return localFilter.loadTop()
     }
 
+    fun clearFeed() {
+        _feedContent.update { FeedState.Loading }
+    }
+
     fun refresh() {
         val scope = CoroutineScope(Job() + Dispatchers.Default)
         scope.launch {

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

@@ -80,7 +80,9 @@ fun ThreadFeedView(noteId: String, viewModel: FeedViewModel, accountViewModel: A
                     is FeedState.Loaded -> {
                         LaunchedEffect(noteId) {
                             val noteForPosition = state.feed.value.filter { it.idHex == noteId}.firstOrNull()
-                            listState.animateScrollToItem(state.feed.value.indexOf(noteForPosition), 0)
+                            val position = state.feed.value.indexOf(noteForPosition)
+                            if (position > 0)
+                                listState.animateScrollToItem(position, 0)
                         }
 
                         LazyColumn(

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/ThreadScreen.kt

@@ -28,7 +28,8 @@ fun ThreadScreen(noteId: String?, accountViewModel: AccountViewModel, navControl
     if (account != null && noteId != null) {
         val feedViewModel: NostrThreadFeedViewModel = viewModel()
 
-        LaunchedEffect(Unit) {
+        LaunchedEffect(noteId) {
+            feedViewModel.clearFeed()
             ThreadFeedFilter.loadThread(noteId)
             NostrThreadDataSource.loadThread(noteId)
             feedViewModel.invalidateData()